/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c

Bug Summary

File:	ksp/pc/impls/mg/mg.c
Warning:	line 421, column 29 Array access (from variable 'mglevels') results in a null pointer dereference

Annotated Source Code

[?] Use j/k keys for keyboard navigation

Defines the multigrid preconditioner interface.

#include <petsc/private/pcmgimpl.h> /*I "petscksp.h" I*/

#include <petscdm.h>

PETSC_INTERNextern __attribute__((visibility ("hidden"))) PetscErrorCode PCPreSolveChangeRHS(PC,PetscBool*);

PetscErrorCode PCMGMCycle_Private(PC pc,PC_MG_Levels **mglevelsin,PCRichardsonConvergedReason *reason)

{

PC_MG *mg = (PC_MG*)pc->data;

PC_MG_Levels *mgc,*mglevels = *mglevelsin;

PetscErrorCode ierr;

PetscInt cycles = (mglevels->level == 1) ? 1 : (PetscInt) mglevels->cycles;

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 16; petscstack->petscroutine
[petscstack->currentsize] = PETSC_TRUE; petscstack->currentsize
++; } if (petscstack) { petscstack->hotdepth += (PETSC_FALSE
|| petscstack->hotdepth); } ; } while (0); ; } while (0);

if (mglevels->eventsmoothsolve) {ierr = PetscLogEventBegin(mglevels->eventsmoothsolve,0,0,0,0)(((PetscLogPLB && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels->eventsmoothsolve].active) ? (*PetscLogPLB)((mglevels
->eventsmoothsolve),0,(PetscObject)(0),(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),17,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

ierr = KSPSolve(mglevels->smoothd,mglevels->b,mglevels->x);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),18,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0); /* pre-smooth */

ierr = KSPCheckSolve(mglevels->smoothd,pc,mglevels->x);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),19,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

if (mglevels->eventsmoothsolve) {ierr = PetscLogEventEnd(mglevels->eventsmoothsolve,0,0,0,0)(((PetscLogPLE && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels->eventsmoothsolve].active) ? (*PetscLogPLE)((mglevels
->eventsmoothsolve),0,(PetscObject)(0),(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),20,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

if (mglevels->level) { /* not the coarsest grid */

if (mglevels->eventresidual) {ierr = PetscLogEventBegin(mglevels->eventresidual,0,0,0,0)(((PetscLogPLB && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels->eventresidual].active) ? (*PetscLogPLB)((mglevels
->eventresidual),0,(PetscObject)(0),(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),22,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

ierr = (*mglevels->residual)(mglevels->A,mglevels->b,mglevels->x,mglevels->r);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),23,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

if (mglevels->eventresidual) {ierr = PetscLogEventEnd(mglevels->eventresidual,0,0,0,0)(((PetscLogPLE && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels->eventresidual].active) ? (*PetscLogPLE)((mglevels
->eventresidual),0,(PetscObject)(0),(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),24,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

/* if on finest level and have convergence criteria set */

if (mglevels->level == mglevels->levels-1 && mg->ttol && reason) {

PetscReal rnorm;

ierr = VecNorm(mglevels->r,NORM_2,&rnorm);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),29,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

if (rnorm <= mg->ttol) {

if (rnorm < mg->abstol) {

*reason = PCRICHARDSON_CONVERGED_ATOL;

ierr = PetscInfo2(pc,"Linear solver has converged. Residual norm %g is less than absolute tolerance %g\n",(double)rnorm,(double)mg->abstol)PetscInfo_Private(__func__,pc,"Linear solver has converged. Residual norm %g is less than absolute tolerance %g\n"
,(double)rnorm,(double)mg->abstol);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),33,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

} else {

*reason = PCRICHARDSON_CONVERGED_RTOL;

ierr = PetscInfo2(pc,"Linear solver has converged. Residual norm %g is less than relative tolerance times initial residual norm %g\n",(double)rnorm,(double)mg->ttol)PetscInfo_Private(__func__,pc,"Linear solver has converged. Residual norm %g is less than relative tolerance times initial residual norm %g\n"
,(double)rnorm,(double)mg->ttol);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),36,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

}

PetscFunctionReturn(0)do { do { ; if (petscstack && petscstack->currentsize
> 0) { petscstack->currentsize--; petscstack->function
[petscstack->currentsize] = 0; petscstack->file[petscstack
->currentsize] = 0; petscstack->line[petscstack->currentsize
] = 0; petscstack->petscroutine[petscstack->currentsize
] = PETSC_FALSE; } if (petscstack) { petscstack->hotdepth =
(((petscstack->hotdepth-1)<(0)) ? (0) : (petscstack->
hotdepth-1)); } ; } while (0); return(0);} while (0);

}

mgc = *(mglevelsin - 1);

if (mglevels->eventinterprestrict) {ierr = PetscLogEventBegin(mglevels->eventinterprestrict,0,0,0,0)(((PetscLogPLB && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels->eventinterprestrict].active) ? (*PetscLogPLB)((
mglevels->eventinterprestrict),0,(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),43,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

ierr = MatRestrict(mglevels->restrct,mglevels->r,mgc->b);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),44,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

if (mglevels->eventinterprestrict) {ierr = PetscLogEventEnd(mglevels->eventinterprestrict,0,0,0,0)(((PetscLogPLE && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels->eventinterprestrict].active) ? (*PetscLogPLE)((
mglevels->eventinterprestrict),0,(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),45,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

ierr = VecSet(mgc->x,0.0);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),46,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

while (cycles--) {

ierr = PCMGMCycle_Private(pc,mglevelsin-1,reason);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),48,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

}

if (mglevels->eventinterprestrict) {ierr = PetscLogEventBegin(mglevels->eventinterprestrict,0,0,0,0)(((PetscLogPLB && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels->eventinterprestrict].active) ? (*PetscLogPLB)((
mglevels->eventinterprestrict),0,(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),50,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

ierr = MatInterpolateAdd(mglevels->interpolate,mgc->x,mglevels->x,mglevels->x);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),51,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

if (mglevels->eventinterprestrict) {ierr = PetscLogEventEnd(mglevels->eventinterprestrict,0,0,0,0)(((PetscLogPLE && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels->eventinterprestrict].active) ? (*PetscLogPLE)((
mglevels->eventinterprestrict),0,(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),52,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

if (mglevels->eventsmoothsolve) {ierr = PetscLogEventBegin(mglevels->eventsmoothsolve,0,0,0,0)(((PetscLogPLB && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels->eventsmoothsolve].active) ? (*PetscLogPLB)((mglevels
->eventsmoothsolve),0,(PetscObject)(0),(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),53,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

ierr = KSPSolve(mglevels->smoothu,mglevels->b,mglevels->x);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),54,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0); /* post smooth */

ierr = KSPCheckSolve(mglevels->smoothu,pc,mglevels->x);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),55,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

if (mglevels->eventsmoothsolve) {ierr = PetscLogEventEnd(mglevels->eventsmoothsolve,0,0,0,0)(((PetscLogPLE && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels->eventsmoothsolve].active) ? (*PetscLogPLE)((mglevels
->eventsmoothsolve),0,(PetscObject)(0),(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),56,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

}

static PetscErrorCode PCApplyRichardson_MG(PC pc,Vec b,Vec x,Vec w,PetscReal rtol,PetscReal abstol, PetscReal dtol,PetscInt its,PetscBool zeroguess,PetscInt *outits,PCRichardsonConvergedReason *reason)

{

PC_MG *mg = (PC_MG*)pc->data;

PC_MG_Levels **mglevels = mg->levels;

PetscErrorCode ierr;

PC tpc;

PetscBool changeu,changed;

PetscInt levels = mglevels[0]->levels,i;

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 70; petscstack->petscroutine
[petscstack->currentsize] = PETSC_TRUE; petscstack->currentsize
++; } if (petscstack) { petscstack->hotdepth += (PETSC_FALSE
|| petscstack->hotdepth); } ; } while (0); ; } while (0);

/* When the DM is supplying the matrix then it will not exist until here */

for (i=0; i<levels; i++) {

if (!mglevels[i]->A) {

ierr = KSPGetOperators(mglevels[i]->smoothu,&mglevels[i]->A,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),74,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

ierr = PetscObjectReference((PetscObject)mglevels[i]->A);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),75,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

}

ierr = KSPGetPC(mglevels[levels-1]->smoothd,&tpc);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),79,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

ierr = PCPreSolveChangeRHS(tpc,&changed);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),80,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

ierr = KSPGetPC(mglevels[levels-1]->smoothu,&tpc);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),81,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

ierr = PCPreSolveChangeRHS(tpc,&changeu);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),82,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

if (!changed && !changeu) {

ierr = VecDestroy(&mglevels[levels-1]->b);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),84,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

mglevels[levels-1]->b = b;

} else { /* if the smoother changes the rhs during PreSolve, we cannot use the input vector */

if (!mglevels[levels-1]->b) {

Vec *vec;

ierr = KSPCreateVecs(mglevels[levels-1]->smoothd,1,&vec,0,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),90,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

mglevels[levels-1]->b = *vec;

ierr = PetscFree(vec)((*PetscTrFree)((void*)(vec),92,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((vec) = 0,0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),92,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

}

ierr = VecCopy(b,mglevels[levels-1]->b);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),94,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

}

mglevels[levels-1]->x = x;

mg->rtol = rtol;

mg->abstol = abstol;

100

mg->dtol = dtol;

101

if (rtol) {

102

/* compute initial residual norm for relative convergence test */

103

PetscReal rnorm;

104

if (zeroguess) {

105

ierr = VecNorm(b,NORM_2,&rnorm);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),105,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

106

} else {

107

ierr = (*mglevels[levels-1]->residual)(mglevels[levels-1]->A,b,x,w);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),107,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

108

ierr = VecNorm(w,NORM_2,&rnorm);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),108,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

109

}

110

mg->ttol = PetscMax(rtol*rnorm,abstol)(((rtol*rnorm)<(abstol)) ? (abstol) : (rtol*rnorm));

111

} else if (abstol) mg->ttol = abstol;

112

else mg->ttol = 0.0;

113

114

/* since smoother is applied to full system, not just residual we need to make sure that smoothers don't

115

stop prematurely due to small residual */

116

for (i=1; i<levels; i++) {

117

ierr = KSPSetTolerances(mglevels[i]->smoothu,0,PETSC_DEFAULT-2,PETSC_DEFAULT-2,PETSC_DEFAULT-2);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),117,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

118

if (mglevels[i]->smoothu != mglevels[i]->smoothd) {

119

/* For Richardson the initial guess is nonzero since it is solving in each cycle the original system not just applying as a preconditioner */

120

ierr = KSPSetInitialGuessNonzero(mglevels[i]->smoothd,PETSC_TRUE);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),120,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

121

ierr = KSPSetTolerances(mglevels[i]->smoothd,0,PETSC_DEFAULT-2,PETSC_DEFAULT-2,PETSC_DEFAULT-2);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),121,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

122

}

123

}

124

125

*reason = (PCRichardsonConvergedReason)0;

126

for (i=0; i<its; i++) {

127

ierr = PCMGMCycle_Private(pc,mglevels+levels-1,reason);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),127,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

128

if (*reason) break;

129

}

130

if (!*reason) *reason = PCRICHARDSON_CONVERGED_ITS;

131

*outits = i;

132

if (!changed && !changeu) mglevels[levels-1]->b = NULL((void*)0);

133

134

}

135

136

PetscErrorCode PCReset_MG(PC pc)

137

{

138

PC_MG *mg = (PC_MG*)pc->data;

139

PC_MG_Levels **mglevels = mg->levels;

140

PetscErrorCode ierr;

141

PetscInt i,n;

142

143

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 143; petscstack->petscroutine
[petscstack->currentsize] = PETSC_TRUE; petscstack->currentsize
++; } if (petscstack) { petscstack->hotdepth += (PETSC_FALSE
|| petscstack->hotdepth); } ; } while (0); ; } while (0);

144

if (mglevels) {

145

n = mglevels[0]->levels;

146

for (i=0; i<n-1; i++) {

147

ierr = VecDestroy(&mglevels[i+1]->r);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),147,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

148

ierr = VecDestroy(&mglevels[i]->b);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),148,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

149

ierr = VecDestroy(&mglevels[i]->x);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),149,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

150

ierr = MatDestroy(&mglevels[i+1]->restrct);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),150,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

151

ierr = MatDestroy(&mglevels[i+1]->interpolate);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),151,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

152

ierr = MatDestroy(&mglevels[i+1]->inject);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),152,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

153

ierr = VecDestroy(&mglevels[i+1]->rscale);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),153,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

154

}

155

/* this is not null only if the smoother on the finest level

156

changes the rhs during PreSolve */

157

ierr = VecDestroy(&mglevels[n-1]->b);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),157,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

158

159

for (i=0; i<n; i++) {

160

ierr = MatDestroy(&mglevels[i]->A);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),160,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

161

if (mglevels[i]->smoothd != mglevels[i]->smoothu) {

162

ierr = KSPReset(mglevels[i]->smoothd);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),162,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

163

}

164

ierr = KSPReset(mglevels[i]->smoothu);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),164,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

165

}

166

}

167

168

}

169

170

PetscErrorCode PCMGSetLevels_MG(PC pc,PetscInt levels,MPI_Comm *comms)

171

{

172

PetscErrorCode ierr;

173

PC_MG *mg = (PC_MG*)pc->data;

174

MPI_Comm comm;

175

PC_MG_Levels **mglevels = mg->levels;

176

PCMGType mgtype = mg->am;

177

PetscInt mgctype = (PetscInt) PC_MG_CYCLE_V;

178

PetscInt i;

179

PetscMPIInt size;

180

const char *prefix;

181

PC ipc;

182

PetscInt n;

183

184

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 184; petscstack->petscroutine
[petscstack->currentsize] = PETSC_TRUE; petscstack->currentsize
++; } if (petscstack) { petscstack->hotdepth += (PETSC_FALSE
|| petscstack->hotdepth); } ; } while (0); ; } while (0);

185

PetscValidHeaderSpecific(pc,PC_CLASSID,1)do { if (!pc) return PetscError(((MPI_Comm)0x44000001),185,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",85,PETSC_ERROR_INITIAL
,"Null Object: Parameter # %d",1); if (!PetscCheckPointer(pc,
PETSC_OBJECT)) return PetscError(((MPI_Comm)0x44000001),185,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",64,PETSC_ERROR_INITIAL
,"Invalid Pointer to Object: Parameter # %d",1); if (((PetscObject
)(pc))->classid != PC_CLASSID) { if (((PetscObject)(pc))->
classid == -1) return PetscError(((MPI_Comm)0x44000001),185,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",64,PETSC_ERROR_INITIAL
,"Object already free: Parameter # %d",1); else return PetscError
(((MPI_Comm)0x44000001),185,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,62,PETSC_ERROR_INITIAL,"Wrong type of object: Parameter # %d"
,1); } } while (0);

186

PetscValidLogicalCollectiveInt(pc,levels,2)do { PetscErrorCode _7_ierr; PetscInt b1[2],b2[2]; b1[0] = -levels
; b1[1] = levels; _7_ierr = (PetscAllreduceBarrierCheck(PetscObjectComm
((PetscObject)pc),2,186,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((petsc_allreduce_ct += PetscMPIParallelComm((PetscObjectComm
((PetscObject)pc))),0) || MPI_Allreduce((b1),(b2),(2),(((MPI_Datatype
)0x4c000405)),((MPI_Op)(0x58000001)),(PetscObjectComm((PetscObject
)pc)))));do {if (__builtin_expect(!!(_7_ierr),0)) return PetscError
(((MPI_Comm)0x44000001),186,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,_7_ierr,PETSC_ERROR_REPEAT," ");} while (0); if (-b2[0] != b2
[1]) return PetscError(PetscObjectComm((PetscObject)pc),186,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",62,PETSC_ERROR_INITIAL
,"Int value must be same on all processes, argument # %d",2);
} while (0);

187

if (mg->nlevels == levels) PetscFunctionReturn(0)do { do { ; if (petscstack && petscstack->currentsize
> 0) { petscstack->currentsize--; petscstack->function
[petscstack->currentsize] = 0; petscstack->file[petscstack
->currentsize] = 0; petscstack->line[petscstack->currentsize
] = 0; petscstack->petscroutine[petscstack->currentsize
] = PETSC_FALSE; } if (petscstack) { petscstack->hotdepth =
(((petscstack->hotdepth-1)<(0)) ? (0) : (petscstack->
hotdepth-1)); } ; } while (0); return(0);} while (0);

188

ierr = PetscObjectGetComm((PetscObject)pc,&comm);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),188,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

189

if (mglevels) {

190

mgctype = mglevels[0]->cycles;

191

/* changing the number of levels so free up the previous stuff */

192

ierr = PCReset_MG(pc);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),192,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

193

n = mglevels[0]->levels;

194

for (i=0; i<n; i++) {

195

if (mglevels[i]->smoothd != mglevels[i]->smoothu) {

196

ierr = KSPDestroy(&mglevels[i]->smoothd);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),196,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

197

}

198

ierr = KSPDestroy(&mglevels[i]->smoothu);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),198,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

199

ierr = PetscFree(mglevels[i])((*PetscTrFree)((void*)(mglevels[i]),199,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((mglevels[i]) = 0,0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),199,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

200

}

201

ierr = PetscFree(mg->levels)((*PetscTrFree)((void*)(mg->levels),201,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((mg->levels) = 0,0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),201,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

202

}

203

204

mg->nlevels = levels;

205

206

ierr = PetscMalloc1(levels,&mglevels)PetscMallocA(1,PETSC_FALSE,206,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,(size_t)(levels)*sizeof(**(&mglevels)),(&mglevels));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),206,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

207

ierr = PetscLogObjectMemory((PetscObject)pc,levels*(sizeof(PC_MG*)));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),207,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

208

209

ierr = PCGetOptionsPrefix(pc,&prefix);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),209,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

210

211

mg->stageApply = 0;

212

for (i=0; i<levels; i++) {

213

ierr = PetscNewLog(pc,&mglevels[i])(PetscMallocA(1,PETSC_TRUE,213,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,(size_t)(1)*sizeof(**(((&mglevels[i])))),(((&mglevels
[i])))) || PetscLogObjectMemory((PetscObject)pc,sizeof(**(&
mglevels[i]))));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),213,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

214

215

mglevels[i]->level = i;

216

mglevels[i]->levels = levels;

217

mglevels[i]->cycles = mgctype;

218

mg->default_smoothu = 2;

219

mg->default_smoothd = 2;

220

mglevels[i]->eventsmoothsetup = 0;

221

mglevels[i]->eventsmoothsolve = 0;

222

mglevels[i]->eventresidual = 0;

223

mglevels[i]->eventinterprestrict = 0;

224

225

if (comms) comm = comms[i];

226

ierr = KSPCreate(comm,&mglevels[i]->smoothd);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),226,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

227

ierr = KSPSetErrorIfNotConverged(mglevels[i]->smoothd,pc->erroriffailure);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),227,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

228

ierr = PetscObjectIncrementTabLevel((PetscObject)mglevels[i]->smoothd,(PetscObject)pc,levels-i);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),228,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

229

ierr = KSPSetOptionsPrefix(mglevels[i]->smoothd,prefix);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),229,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

230

ierr = PetscObjectComposedDataSetInt((PetscObject) mglevels[i]->smoothd, PetscMGLevelId, mglevels[i]->level)(((((PetscObject) mglevels[i]->smoothd)->int_idmax <
PetscObjectComposedDataMax) && PetscObjectComposedDataIncreaseInt
((PetscObject) mglevels[i]->smoothd)) || (((PetscObject) mglevels
[i]->smoothd)->intcomposeddata[PetscMGLevelId] = mglevels
[i]->level,((PetscObject) mglevels[i]->smoothd)->intcomposedstate
[PetscMGLevelId] = ((PetscObject) mglevels[i]->smoothd)->
state, 0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),230,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

231

if (i || levels == 1) {

232

char tprefix[128];

233

234

ierr = KSPSetType(mglevels[i]->smoothd,KSPCHEBYSHEV"chebyshev");CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),234,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

235

ierr = KSPSetConvergenceTest(mglevels[i]->smoothd,KSPConvergedSkip,NULL((void*)0),NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),235,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

236

ierr = KSPSetNormType(mglevels[i]->smoothd,KSP_NORM_NONE);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),236,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

237

ierr = KSPGetPC(mglevels[i]->smoothd,&ipc);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),237,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

238

ierr = PCSetType(ipc,PCSOR"sor");CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),238,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

239

ierr = KSPSetTolerances(mglevels[i]->smoothd,PETSC_DEFAULT-2,PETSC_DEFAULT-2,PETSC_DEFAULT-2, mg->default_smoothd);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),239,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

240

241

sprintf(tprefix,"mg_levels_%d_",(int)i);

242

ierr = KSPAppendOptionsPrefix(mglevels[i]->smoothd,tprefix);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),242,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

243

} else {

244

ierr = KSPAppendOptionsPrefix(mglevels[0]->smoothd,"mg_coarse_");CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),244,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

245

246

/* coarse solve is (redundant) LU by default; set shifttype NONZERO to avoid annoying zero-pivot in LU preconditioner */

247

ierr = KSPSetType(mglevels[0]->smoothd,KSPPREONLY"preonly");CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),247,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

248

ierr = KSPGetPC(mglevels[0]->smoothd,&ipc);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),248,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

249

ierr = MPI_Comm_size(comm,&size);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),249,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

250

if (size > 1) {

251

ierr = PCSetType(ipc,PCREDUNDANT"redundant");CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),251,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

252

} else {

253

ierr = PCSetType(ipc,PCLU"lu");CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),253,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

254

}

255

ierr = PCFactorSetShiftType(ipc,MAT_SHIFT_INBLOCKS);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),255,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

256

}

257

ierr = PetscLogObjectParent((PetscObject)pc,(PetscObject)mglevels[i]->smoothd);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),257,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

258

259

mglevels[i]->smoothu = mglevels[i]->smoothd;

260

mg->rtol = 0.0;

261

mg->abstol = 0.0;

262

mg->dtol = 0.0;

263

mg->ttol = 0.0;

264

mg->cyclesperpcapply = 1;

265

}

266

mg->levels = mglevels;

267

ierr = PCMGSetType(pc,mgtype);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),267,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

268

269

}

270

271

/*@C

272

PCMGSetLevels - Sets the number of levels to use with MG.

273

Must be called before any other MG routine.

274

275

Logically Collective on PC

276

277

Input Parameters:

278

+ pc - the preconditioner context

279

. levels - the number of levels

280

- comms - optional communicators for each level; this is to allow solving the coarser problems

281

on smaller sets of processors.

282

283

Level: intermediate

284

285

Notes:

286

If the number of levels is one then the multigrid uses the -mg_levels prefix

287

for setting the level options rather than the -mg_coarse prefix.

288

289

.seealso: PCMGSetType(), PCMGGetLevels()

290

@*/

291

PetscErrorCode PCMGSetLevels(PC pc,PetscInt levels,MPI_Comm *comms)

292

{

293

PetscErrorCode ierr;

294

295

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 295; petscstack->petscroutine
[petscstack->currentsize] = PETSC_TRUE; petscstack->currentsize
++; } if (petscstack) { petscstack->hotdepth += (PETSC_FALSE
|| petscstack->hotdepth); } ; } while (0); ; } while (0);

296

PetscValidHeaderSpecific(pc,PC_CLASSID,1)do { if (!pc) return PetscError(((MPI_Comm)0x44000001),296,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",85,PETSC_ERROR_INITIAL
,"Null Object: Parameter # %d",1); if (!PetscCheckPointer(pc,
PETSC_OBJECT)) return PetscError(((MPI_Comm)0x44000001),296,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",64,PETSC_ERROR_INITIAL
,"Invalid Pointer to Object: Parameter # %d",1); if (((PetscObject
)(pc))->classid != PC_CLASSID) { if (((PetscObject)(pc))->
classid == -1) return PetscError(((MPI_Comm)0x44000001),296,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",64,PETSC_ERROR_INITIAL
,"Object already free: Parameter # %d",1); else return PetscError
(((MPI_Comm)0x44000001),296,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,62,PETSC_ERROR_INITIAL,"Wrong type of object: Parameter # %d"
,1); } } while (0);

297

if (comms) PetscValidPointer(comms,3)do { if (!comms) return PetscError(((MPI_Comm)0x44000001),297
,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,85,PETSC_ERROR_INITIAL,"Null Pointer: Parameter # %d",3); if
(!PetscCheckPointer(comms,PETSC_CHAR)) return PetscError(((MPI_Comm
)0x44000001),297,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,68,PETSC_ERROR_INITIAL,"Invalid Pointer: Parameter # %d",3);
} while (0);

298

ierr = PetscTryMethod(pc,"PCMGSetLevels_C",(PC,PetscInt,MPI_Comm*),(pc,levels,comms))0; do { PetscErrorCode (*_7_f)(PC,PetscInt,MPI_Comm*), _7_ierr
; _7_ierr = PetscObjectQueryFunction_Private(((PetscObject)(pc
)),("PCMGSetLevels_C"),(PetscVoidFunction*)(&_7_f));do {if
(__builtin_expect(!!(_7_ierr),0)) return PetscError(((MPI_Comm
)0x44000001),298,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,_7_ierr,PETSC_ERROR_REPEAT," ");} while (0); if (_7_f) {_7_ierr
= (*_7_f)(pc,levels,comms);do {if (__builtin_expect(!!(_7_ierr
),0)) return PetscError(((MPI_Comm)0x44000001),298,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,_7_ierr,PETSC_ERROR_REPEAT," ");} while (0);} } while(0);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),298,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

299

300

}

301

302

303

PetscErrorCode PCDestroy_MG(PC pc)

304

{

305

PetscErrorCode ierr;

306

PC_MG *mg = (PC_MG*)pc->data;

307

PC_MG_Levels **mglevels = mg->levels;

308

PetscInt i,n;

309

310

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 310; petscstack->petscroutine
[petscstack->currentsize] = PETSC_TRUE; petscstack->currentsize
++; } if (petscstack) { petscstack->hotdepth += (PETSC_FALSE
|| petscstack->hotdepth); } ; } while (0); ; } while (0);

311

ierr = PCReset_MG(pc);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),311,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

312

if (mglevels) {

313

n = mglevels[0]->levels;

314

for (i=0; i<n; i++) {

315

if (mglevels[i]->smoothd != mglevels[i]->smoothu) {

316

ierr = KSPDestroy(&mglevels[i]->smoothd);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),316,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

317

}

318

ierr = KSPDestroy(&mglevels[i]->smoothu);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),318,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

319

ierr = PetscFree(mglevels[i])((*PetscTrFree)((void*)(mglevels[i]),319,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((mglevels[i]) = 0,0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),319,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

320

}

321

ierr = PetscFree(mg->levels)((*PetscTrFree)((void*)(mg->levels),321,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((mg->levels) = 0,0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),321,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

322

}

323

ierr = PetscFree(pc->data)((*PetscTrFree)((void*)(pc->data),323,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((pc->data) = 0,0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),323,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

324

ierr = PetscObjectComposeFunction((PetscObject)pc,"PCGetInterpolations_C",NULL)PetscObjectComposeFunction_Private((PetscObject)pc,"PCGetInterpolations_C"
,(PetscVoidFunction)(((void*)0)));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),324,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

325

ierr = PetscObjectComposeFunction((PetscObject)pc,"PCGetCoarseOperators_C",NULL)PetscObjectComposeFunction_Private((PetscObject)pc,"PCGetCoarseOperators_C"
,(PetscVoidFunction)(((void*)0)));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),325,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

326

327

}

328

329

330

331

extern PetscErrorCode PCMGACycle_Private(PC,PC_MG_Levels**);

332

extern PetscErrorCode PCMGFCycle_Private(PC,PC_MG_Levels**);

333

extern PetscErrorCode PCMGKCycle_Private(PC,PC_MG_Levels**);

334

335

336

PCApply_MG - Runs either an additive, multiplicative, Kaskadic

337

or full cycle of multigrid.

338

339

Note:

340

A simple wrapper which calls PCMGMCycle(),PCMGACycle(), or PCMGFCycle().

341

342

static PetscErrorCode PCApply_MG(PC pc,Vec b,Vec x)

343

{

344

PC_MG *mg = (PC_MG*)pc->data;

345

PC_MG_Levels **mglevels = mg->levels;

346

PetscErrorCode ierr;

347

PC tpc;

348

PetscInt levels = mglevels[0]->levels,i;

349

PetscBool changeu,changed;

350

351

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 351; petscstack->petscroutine
[petscstack->currentsize] = PETSC_TRUE; petscstack->currentsize
++; } if (petscstack) { petscstack->hotdepth += (PETSC_FALSE
|| petscstack->hotdepth); } ; } while (0); ; } while (0);

352

if (mg->stageApply) {ierr = PetscLogStagePush(mg->stageApply);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),352,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

353

/* When the DM is supplying the matrix then it will not exist until here */

354

for (i=0; i<levels; i++) {

355

if (!mglevels[i]->A) {

356

ierr = KSPGetOperators(mglevels[i]->smoothu,&mglevels[i]->A,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),356,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

357

ierr = PetscObjectReference((PetscObject)mglevels[i]->A);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),357,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

358

}

359

}

360

361

ierr = KSPGetPC(mglevels[levels-1]->smoothd,&tpc);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),361,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

362

ierr = PCPreSolveChangeRHS(tpc,&changed);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),362,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

363

ierr = KSPGetPC(mglevels[levels-1]->smoothu,&tpc);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),363,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

364

ierr = PCPreSolveChangeRHS(tpc,&changeu);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),364,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

365

if (!changeu && !changed) {

366

ierr = VecDestroy(&mglevels[levels-1]->b);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),366,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

367

mglevels[levels-1]->b = b;

368

} else { /* if the smoother changes the rhs during PreSolve, we cannot use the input vector */

369

if (!mglevels[levels-1]->b) {

370

Vec *vec;

371

372

ierr = KSPCreateVecs(mglevels[levels-1]->smoothd,1,&vec,0,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),372,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

373

mglevels[levels-1]->b = *vec;

374

ierr = PetscFree(vec)((*PetscTrFree)((void*)(vec),374,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((vec) = 0,0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),374,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

375

}

376

ierr = VecCopy(b,mglevels[levels-1]->b);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),376,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

377

}

378

mglevels[levels-1]->x = x;

379

380

if (mg->am == PC_MG_MULTIPLICATIVE) {

381

ierr = VecSet(x,0.0);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),381,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

382

for (i=0; i<mg->cyclesperpcapply; i++) {

383

ierr = PCMGMCycle_Private(pc,mglevels+levels-1,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),383,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

384

}

385

} else if (mg->am == PC_MG_ADDITIVE) {

386

ierr = PCMGACycle_Private(pc,mglevels);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),386,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

387

} else if (mg->am == PC_MG_KASKADE) {

388

ierr = PCMGKCycle_Private(pc,mglevels);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),388,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

389

} else {

390

ierr = PCMGFCycle_Private(pc,mglevels);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),390,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

391

}

392

if (mg->stageApply) {ierr = PetscLogStagePop();CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),392,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

393

if (!changeu && !changed) mglevels[levels-1]->b = NULL((void*)0);

394

395

}

396

397

398

PetscErrorCode PCSetFromOptions_MG(PetscOptionItems *PetscOptionsObject,PC pc)

399

{

400

PetscErrorCode ierr;

401

PetscInt levels,cycles;

402

PetscBool flg;

403

PC_MG *mg = (PC_MG*)pc->data;

404

PC_MG_Levels **mglevels;

405

PCMGType mgtype;

406

PCMGCycleType mgctype;

407

PCMGGalerkinType gtype;

408

409

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 409; petscstack->petscroutine
[petscstack->currentsize] = PETSC_TRUE; petscstack->currentsize
++; } if (petscstack) { petscstack->hotdepth += (PETSC_FALSE
|| petscstack->hotdepth); } ; } while (0); ; } while (0);

410

levels = PetscMax(mg->nlevels,1)(((mg->nlevels)<(1)) ? (1) : (mg->nlevels));

411

ierr = PetscOptionsHead(PetscOptionsObject,"Multigrid options");CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),411,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

412

ierr = PetscOptionsInt("-pc_mg_levels","Number of Levels","PCMGSetLevels",levels,&levels,&flg)PetscOptionsInt_Private(PetscOptionsObject,"-pc_mg_levels","Number of Levels"
,"PCMGSetLevels",levels,&levels,&flg,(-2147483647 - 1
),2147483647);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),412,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

413

if (!flg && !mg->levels && pc->dm) {

Assuming 'flg' is 0

→

←

Assuming pointer value is null

→

←

Assuming the condition is false

→

←

Taking false branch

→

414

ierr = DMGetRefineLevel(pc->dm,&levels);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),414,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

415

levels++;

416

mg->usedmfornumberoflevels = PETSC_TRUE;

417

}

418

ierr = PCMGSetLevels(pc,levels,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),418,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

419

mglevels = mg->levels;

←

Null pointer value stored to 'mglevels'

→

420

421

mgctype = (PCMGCycleType) mglevels[0]->cycles;

←

Array access (from variable 'mglevels') results in a null pointer dereference

422

ierr = PetscOptionsEnum("-pc_mg_cycle_type","V cycle or for W-cycle","PCMGSetCycleType",PCMGCycleTypes,(PetscEnum)mgctype,(PetscEnum*)&mgctype,&flg)PetscOptionsEnum_Private(PetscOptionsObject,"-pc_mg_cycle_type"
,"V cycle or for W-cycle","PCMGSetCycleType",PCMGCycleTypes,(
PetscEnum)mgctype,(PetscEnum*)&mgctype,&flg);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),422,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

423

if (flg) {

424

ierr = PCMGSetCycleType(pc,mgctype);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),424,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

425

}

426

gtype = mg->galerkin;

427

ierr = PetscOptionsEnum("-pc_mg_galerkin","Use Galerkin process to compute coarser operators","PCMGSetGalerkin",PCMGGalerkinTypes,(PetscEnum)gtype,(PetscEnum*)&gtype,&flg)PetscOptionsEnum_Private(PetscOptionsObject,"-pc_mg_galerkin"
,"Use Galerkin process to compute coarser operators","PCMGSetGalerkin"
,PCMGGalerkinTypes,(PetscEnum)gtype,(PetscEnum*)&gtype,&
flg);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),427,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

428

if (flg) {

429

ierr = PCMGSetGalerkin(pc,gtype);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),429,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

430

}

431

flg = PETSC_FALSE;

432

ierr = PetscOptionsBool("-pc_mg_distinct_smoothup","Create seperate smoothup KSP and append the prefix _up","PCMGSetDistinctSmoothUp",PETSC_FALSE,&flg,NULL)PetscOptionsBool_Private(PetscOptionsObject,"-pc_mg_distinct_smoothup"
,"Create seperate smoothup KSP and append the prefix _up","PCMGSetDistinctSmoothUp"
,PETSC_FALSE,&flg,((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),432,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

433

if (flg) {

434

ierr = PCMGSetDistinctSmoothUp(pc);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),434,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

435

}

436

mgtype = mg->am;

437

ierr = PetscOptionsEnum("-pc_mg_type","Multigrid type","PCMGSetType",PCMGTypes,(PetscEnum)mgtype,(PetscEnum*)&mgtype,&flg)PetscOptionsEnum_Private(PetscOptionsObject,"-pc_mg_type","Multigrid type"
,"PCMGSetType",PCMGTypes,(PetscEnum)mgtype,(PetscEnum*)&mgtype
,&flg);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),437,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

438

if (flg) {

439

ierr = PCMGSetType(pc,mgtype);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),439,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

440

}

441

if (mg->am == PC_MG_MULTIPLICATIVE) {

442

ierr = PetscOptionsInt("-pc_mg_multiplicative_cycles","Number of cycles for each preconditioner step","PCMGMultiplicativeSetCycles",mg->cyclesperpcapply,&cycles,&flg)PetscOptionsInt_Private(PetscOptionsObject,"-pc_mg_multiplicative_cycles"
,"Number of cycles for each preconditioner step","PCMGMultiplicativeSetCycles"
,mg->cyclesperpcapply,&cycles,&flg,(-2147483647 - 1
),2147483647);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),442,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

443

if (flg) {

444

ierr = PCMGMultiplicativeSetCycles(pc,cycles);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),444,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

445

}

446

}

447

flg = PETSC_FALSE;

448

ierr = PetscOptionsBool("-pc_mg_log","Log times for each multigrid level","None",flg,&flg,NULL)PetscOptionsBool_Private(PetscOptionsObject,"-pc_mg_log","Log times for each multigrid level"
,"None",flg,&flg,((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),448,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

449

if (flg) {

450

PetscInt i;

451

char eventname[128];

452

453

levels = mglevels[0]->levels;

454

for (i=0; i<levels; i++) {

455

sprintf(eventname,"MGSetup Level %d",(int)i);

456

ierr = PetscLogEventRegister(eventname,((PetscObject)pc)->classid,&mglevels[i]->eventsmoothsetup);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),456,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

457

sprintf(eventname,"MGSmooth Level %d",(int)i);

458

ierr = PetscLogEventRegister(eventname,((PetscObject)pc)->classid,&mglevels[i]->eventsmoothsolve);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),458,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

459

if (i) {

460

sprintf(eventname,"MGResid Level %d",(int)i);

461

ierr = PetscLogEventRegister(eventname,((PetscObject)pc)->classid,&mglevels[i]->eventresidual);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),461,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

462

sprintf(eventname,"MGInterp Level %d",(int)i);

463

ierr = PetscLogEventRegister(eventname,((PetscObject)pc)->classid,&mglevels[i]->eventinterprestrict);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),463,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

464

}

465

}

466

467

#if defined(PETSC_USE_LOG1)

468

{

469

const char *sname = "MG Apply";

470

PetscStageLog stageLog;

471

PetscInt st;

472

473

ierr = PetscLogGetStageLog(&stageLog);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),473,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

474

for (st = 0; st < stageLog->numStages; ++st) {

475

PetscBool same;

476

477

ierr = PetscStrcmp(stageLog->stageInfo[st].name, sname, &same);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),477,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

478

if (same) mg->stageApply = st;

479

}

480

if (!mg->stageApply) {

481

ierr = PetscLogStageRegister(sname, &mg->stageApply);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),481,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

482

}

483

}

484

#endif

485

}

486

ierr = PetscOptionsTail()0; do {if (PetscOptionsObject->count != 1) do { do { ; if (
petscstack && petscstack->currentsize > 0) { petscstack
->currentsize--; petscstack->function[petscstack->currentsize
] = 0; petscstack->file[petscstack->currentsize] = 0; petscstack
->line[petscstack->currentsize] = 0; petscstack->petscroutine
[petscstack->currentsize] = PETSC_FALSE; } if (petscstack)
{ petscstack->hotdepth = (((petscstack->hotdepth-1)<
(0)) ? (0) : (petscstack->hotdepth-1)); } ; } while (0); return
(0);} while (0);} while(0);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),486,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

487

488

}

489

490

const char *const PCMGTypes[] = {"MULTIPLICATIVE","ADDITIVE","FULL","KASKADE","PCMGType","PC_MG",0};

491

const char *const PCMGCycleTypes[] = {"invalid","v","w","PCMGCycleType","PC_MG_CYCLE",0};

492

const char *const PCMGGalerkinTypes[] = {"both","pmat","mat","none","external","PCMGGalerkinType","PC_MG_GALERKIN",0};

493

494

#include <petscdraw.h>

495

PetscErrorCode PCView_MG(PC pc,PetscViewer viewer)

496

{

497

PC_MG *mg = (PC_MG*)pc->data;

498

PC_MG_Levels **mglevels = mg->levels;

499

PetscErrorCode ierr;

500

PetscInt levels = mglevels ? mglevels[0]->levels : 0,i;

501

PetscBool iascii,isbinary,isdraw;

502

503

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 503; petscstack->petscroutine
[petscstack->currentsize] = PETSC_TRUE; petscstack->currentsize
++; } if (petscstack) { petscstack->hotdepth += (PETSC_FALSE
|| petscstack->hotdepth); } ; } while (0); ; } while (0);

504

ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII"ascii",&iascii);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),504,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

505

ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERBINARY"binary",&isbinary);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),505,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

506

ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERDRAW"draw",&isdraw);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),506,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

507

if (iascii) {

508

const char *cyclename = levels ? (mglevels[0]->cycles == PC_MG_CYCLE_V ? "v" : "w") : "unknown";

509

ierr = PetscViewerASCIIPrintf(viewer," type is %s, levels=%D cycles=%s\n", PCMGTypes[mg->am],levels,cyclename);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),509,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

510

if (mg->am == PC_MG_MULTIPLICATIVE) {

511

ierr = PetscViewerASCIIPrintf(viewer," Cycles per PCApply=%d\n",mg->cyclesperpcapply);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),511,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

512

}

513

if (mg->galerkin == PC_MG_GALERKIN_BOTH) {

514

ierr = PetscViewerASCIIPrintf(viewer," Using Galerkin computed coarse grid matrices\n");CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),514,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

515

} else if (mg->galerkin == PC_MG_GALERKIN_PMAT) {

516

ierr = PetscViewerASCIIPrintf(viewer," Using Galerkin computed coarse grid matrices for pmat\n");CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),516,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

517

} else if (mg->galerkin == PC_MG_GALERKIN_MAT) {

518

ierr = PetscViewerASCIIPrintf(viewer," Using Galerkin computed coarse grid matrices for mat\n");CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),518,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

519

} else if (mg->galerkin == PC_MG_GALERKIN_EXTERNAL) {

520

ierr = PetscViewerASCIIPrintf(viewer," Using externally compute Galerkin coarse grid matrices\n");CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),520,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

521

} else {

522

ierr = PetscViewerASCIIPrintf(viewer," Not using Galerkin computed coarse grid matrices\n");CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),522,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

523

}

524

if (mg->view){

525

ierr = (*mg->view)(pc,viewer);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),525,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

526

}

527

for (i=0; i<levels; i++) {

528

if (!i) {

529

ierr = PetscViewerASCIIPrintf(viewer,"Coarse grid solver -- level -------------------------------\n",i);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),529,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

530

} else {

531

ierr = PetscViewerASCIIPrintf(viewer,"Down solver (pre-smoother) on level %D -------------------------------\n",i);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),531,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

532

}

533

ierr = PetscViewerASCIIPushTab(viewer);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),533,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

534

ierr = KSPView(mglevels[i]->smoothd,viewer);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),534,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

535

ierr = PetscViewerASCIIPopTab(viewer);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),535,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

536

if (i && mglevels[i]->smoothd == mglevels[i]->smoothu) {

537

ierr = PetscViewerASCIIPrintf(viewer,"Up solver (post-smoother) same as down solver (pre-smoother)\n");CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),537,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

538

} else if (i) {

539

ierr = PetscViewerASCIIPrintf(viewer,"Up solver (post-smoother) on level %D -------------------------------\n",i);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),539,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

540

ierr = PetscViewerASCIIPushTab(viewer);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),540,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

541

ierr = KSPView(mglevels[i]->smoothu,viewer);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),541,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

542

ierr = PetscViewerASCIIPopTab(viewer);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),542,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

543

}

544

}

545

} else if (isbinary) {

546

for (i=levels-1; i>=0; i--) {

547

ierr = KSPView(mglevels[i]->smoothd,viewer);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),547,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

548

if (i && mglevels[i]->smoothd != mglevels[i]->smoothu) {

549

ierr = KSPView(mglevels[i]->smoothu,viewer);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),549,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

550

}

551

}

552

} else if (isdraw) {

553

PetscDraw draw;

554

PetscReal x,w,y,bottom,th;

555

ierr = PetscViewerDrawGetDraw(viewer,0,&draw);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),555,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

556

ierr = PetscDrawGetCurrentPoint(draw,&x,&y);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),556,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

557

ierr = PetscDrawStringGetSize(draw,NULL((void*)0),&th);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),557,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

558

bottom = y - th;

559

for (i=levels-1; i>=0; i--) {

560

if (!mglevels[i]->smoothu || (mglevels[i]->smoothu == mglevels[i]->smoothd)) {

561

ierr = PetscDrawPushCurrentPoint(draw,x,bottom);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),561,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

562

ierr = KSPView(mglevels[i]->smoothd,viewer);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),562,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

563

ierr = PetscDrawPopCurrentPoint(draw);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),563,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

564

} else {

565

w = 0.5*PetscMin(1.0-x,x)(((1.0-x)<(x)) ? (1.0-x) : (x));

566

ierr = PetscDrawPushCurrentPoint(draw,x+w,bottom);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),566,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

567

ierr = KSPView(mglevels[i]->smoothd,viewer);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),567,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

568

ierr = PetscDrawPopCurrentPoint(draw);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),568,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

569

ierr = PetscDrawPushCurrentPoint(draw,x-w,bottom);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),569,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

570

ierr = KSPView(mglevels[i]->smoothu,viewer);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),570,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

571

ierr = PetscDrawPopCurrentPoint(draw);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),571,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

572

}

573

ierr = PetscDrawGetBoundingBox(draw,NULL((void*)0),&bottom,NULL((void*)0),NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),573,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

574

bottom -= th;

575

}

576

}

577

578

}

579

580

#include <petsc/private/dmimpl.h>

581

#include <petsc/private/kspimpl.h>

582

583

584

Calls setup for the KSP on each level

585

586

PetscErrorCode PCSetUp_MG(PC pc)

587

{

588

PC_MG *mg = (PC_MG*)pc->data;

589

PC_MG_Levels **mglevels = mg->levels;

590

PetscErrorCode ierr;

591

PetscInt i,n;

592

PC cpc;

593

PetscBool dump = PETSC_FALSE,opsset,use_amat,missinginterpolate = PETSC_FALSE;

594

Mat dA,dB;

595

Vec tvec;

596

DM *dms;

597

PetscViewer viewer = 0;

598

PetscBool dAeqdB = PETSC_FALSE, needRestricts = PETSC_FALSE;

599

600

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 600; petscstack->petscroutine
[petscstack->currentsize] = PETSC_TRUE; petscstack->currentsize
++; } if (petscstack) { petscstack->hotdepth += (PETSC_FALSE
|| petscstack->hotdepth); } ; } while (0); ; } while (0);

601

if (!mglevels) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_WRONGSTATE,"Must set MG levels with PCMGSetLevels() before setting up")return PetscError(PetscObjectComm((PetscObject)pc),601,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",73,PETSC_ERROR_INITIAL
,"Must set MG levels with PCMGSetLevels() before setting up");

602

n = mglevels[0]->levels;

603

/* FIX: Move this to PCSetFromOptions_MG? */

604

if (mg->usedmfornumberoflevels) {

605

PetscInt levels;

606

ierr = DMGetRefineLevel(pc->dm,&levels);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),606,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

607

levels++;

608

if (levels > n) { /* the problem is now being solved on a finer grid */

609

ierr = PCMGSetLevels(pc,levels,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),609,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

610

n = levels;

611

ierr = PCSetFromOptions(pc);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),611,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0); /* it is bad to call this here, but otherwise will never be called for the new hierarchy */

612

mglevels = mg->levels;

613

}

614

}

615

ierr = KSPGetPC(mglevels[0]->smoothd,&cpc);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),615,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

616

617

618

/* If user did not provide fine grid operators OR operator was not updated since last global KSPSetOperators() */

619

/* so use those from global PC */

620

/* Is this what we always want? What if user wants to keep old one? */

621

ierr = KSPGetOperatorsSet(mglevels[n-1]->smoothd,NULL((void*)0),&opsset);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),621,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

622

if (opsset) {

623

Mat mmat;

624

ierr = KSPGetOperators(mglevels[n-1]->smoothd,NULL((void*)0),&mmat);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),624,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

625

if (mmat == pc->pmat) opsset = PETSC_FALSE;

626

}

627

628

if (!opsset) {

629

ierr = PCGetUseAmat(pc,&use_amat);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),629,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

630

if (use_amat) {

631

ierr = PetscInfo(pc,"Using outer operators to define finest grid operator \n because PCMGGetSmoother(pc,nlevels-1,&ksp);KSPSetOperators(ksp,...); was not called.\n")PetscInfo_Private(__func__,pc,"Using outer operators to define finest grid operator \n because PCMGGetSmoother(pc,nlevels-1,&ksp);KSPSetOperators(ksp,...); was not called.\n"
);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),631,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

632

ierr = KSPSetOperators(mglevels[n-1]->smoothd,pc->mat,pc->pmat);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),632,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

633

} else {

634

ierr = PetscInfo(pc,"Using matrix (pmat) operators to define finest grid operator \n because PCMGGetSmoother(pc,nlevels-1,&ksp);KSPSetOperators(ksp,...); was not called.\n")PetscInfo_Private(__func__,pc,"Using matrix (pmat) operators to define finest grid operator \n because PCMGGetSmoother(pc,nlevels-1,&ksp);KSPSetOperators(ksp,...); was not called.\n"
);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),634,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

635

ierr = KSPSetOperators(mglevels[n-1]->smoothd,pc->pmat,pc->pmat);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),635,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

636

}

637

}

638

639

for (i=n-1; i>0; i--) {

640

if (!(mglevels[i]->interpolate || mglevels[i]->restrct)) {

641

missinginterpolate = PETSC_TRUE;

642

continue;

643

}

644

}

645

646

ierr = KSPGetOperators(mglevels[n-1]->smoothd,&dA,&dB);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),646,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

647

if (dA == dB) dAeqdB = PETSC_TRUE;

648

if ((mg->galerkin == PC_MG_GALERKIN_NONE) || (((mg->galerkin == PC_MG_GALERKIN_PMAT) || (mg->galerkin == PC_MG_GALERKIN_MAT)) && !dAeqdB)) {

649

needRestricts = PETSC_TRUE; /* user must compute either mat, pmat, or both so must restrict x to coarser levels */

650

}

651

652

653

654

Skipping if user has provided all interpolation/restriction needed (since DM might not be able to produce them (when coming from SNES/TS)

655

Skipping for galerkin==2 (externally managed hierarchy such as ML and GAMG). Cleaner logic here would be great. Wrap ML/GAMG as DMs?

656

657

if (missinginterpolate && pc->dm && mg->galerkin != PC_MG_GALERKIN_EXTERNAL && !pc->setupcalled) {

658

/* construct the interpolation from the DMs */

659

Mat p;

660

Vec rscale;

661

ierr = PetscMalloc1(n,&dms)PetscMallocA(1,PETSC_FALSE,661,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,(size_t)(n)*sizeof(**(&dms)),(&dms));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),661,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

662

dms[n-1] = pc->dm;

663

/* Separately create them so we do not get DMKSP interference between levels */

664

for (i=n-2; i>-1; i--) {ierr = DMCoarsen(dms[i+1],MPI_COMM_NULL((MPI_Comm)0x04000000),&dms[i]);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),664,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

665

666

Force the mat type of coarse level operator to be AIJ because usually we want to use LU for coarse level.

667

Notice that it can be overwritten by -mat_type because KSPSetUp() reads command line options.

668

But it is safe to use -dm_mat_type.

669

670

The mat type should not be hardcoded like this, we need to find a better way.

671

ierr = DMSetMatType(dms[0],MATAIJ);CHKERRQ(ierr);

672

673

for (i=n-2; i>-1; i--) {

674

DMKSP kdm;

675

PetscBool dmhasrestrict, dmhasinject;

676

ierr = KSPSetDM(mglevels[i]->smoothd,dms[i]);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),676,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

677

if (!needRestricts) {ierr = KSPSetDMActive(mglevels[i]->smoothd,PETSC_FALSE);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),677,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

678

if (mglevels[i]->smoothd != mglevels[i]->smoothu) {

679

ierr = KSPSetDM(mglevels[i]->smoothu,dms[i]);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),679,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

680

if (!needRestricts) {ierr = KSPSetDMActive(mglevels[i]->smoothu,PETSC_FALSE);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),680,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

681

}

682

ierr = DMGetDMKSPWrite(dms[i],&kdm);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),682,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

683

/* Ugly hack so that the next KSPSetUp() will use the RHS that we set. A better fix is to change dmActive to take

684

* a bitwise OR of computing the matrix, RHS, and initial iterate. */

685

kdm->ops->computerhs = NULL((void*)0);

686

kdm->rhsctx = NULL((void*)0);

687

if (!mglevels[i+1]->interpolate) {

688

ierr = DMCreateInterpolation(dms[i],dms[i+1],&p,&rscale);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),688,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

689

ierr = PCMGSetInterpolation(pc,i+1,p);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),689,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

690

if (rscale) {ierr = PCMGSetRScale(pc,i+1,rscale);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),690,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

691

ierr = VecDestroy(&rscale);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),691,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

692

ierr = MatDestroy(&p);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),692,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

693

}

694

ierr = DMHasCreateRestriction(dms[i],&dmhasrestrict);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),694,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

695

if (dmhasrestrict && !mglevels[i+1]->restrct){

696

ierr = DMCreateRestriction(dms[i],dms[i+1],&p);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),696,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

697

ierr = PCMGSetRestriction(pc,i+1,p);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),697,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

698

ierr = MatDestroy(&p);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),698,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

699

}

700

ierr = DMHasCreateInjection(dms[i],&dmhasinject);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),700,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

701

if (dmhasinject && !mglevels[i+1]->inject){

702

ierr = DMCreateInjection(dms[i],dms[i+1],&p);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),702,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

703

ierr = PCMGSetInjection(pc,i+1,p);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),703,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

704

ierr = MatDestroy(&p);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),704,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

705

}

706

}

707

708

for (i=n-2; i>-1; i--) {ierr = DMDestroy(&dms[i]);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),708,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

709

ierr = PetscFree(dms)((*PetscTrFree)((void*)(dms),709,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((dms) = 0,0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),709,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

710

}

711

712

if (pc->dm && !pc->setupcalled) {

713

/* finest smoother also gets DM but it is not active, independent of whether galerkin==PC_MG_GALERKIN_EXTERNAL */

714

ierr = KSPSetDM(mglevels[n-1]->smoothd,pc->dm);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),714,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

715

ierr = KSPSetDMActive(mglevels[n-1]->smoothd,PETSC_FALSE);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),715,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

716

if (mglevels[n-1]->smoothd != mglevels[n-1]->smoothu) {

717

ierr = KSPSetDM(mglevels[n-1]->smoothu,pc->dm);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),717,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

718

ierr = KSPSetDMActive(mglevels[n-1]->smoothu,PETSC_FALSE);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),718,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

719

}

720

}

721

722

if (mg->galerkin < PC_MG_GALERKIN_NONE) {

723

Mat A,B;

724

PetscBool doA = PETSC_FALSE,doB = PETSC_FALSE;

725

MatReuse reuse = MAT_INITIAL_MATRIX;

726

727

if ((mg->galerkin == PC_MG_GALERKIN_PMAT) || (mg->galerkin == PC_MG_GALERKIN_BOTH)) doB = PETSC_TRUE;

728

if ((mg->galerkin == PC_MG_GALERKIN_MAT) || ((mg->galerkin == PC_MG_GALERKIN_BOTH) && (dA != dB))) doA = PETSC_TRUE;

729

if (pc->setupcalled) reuse = MAT_REUSE_MATRIX;

730

for (i=n-2; i>-1; i--) {

731

if (!mglevels[i+1]->restrct && !mglevels[i+1]->interpolate) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_WRONGSTATE,"Must provide interpolation or restriction for each MG level except level 0")return PetscError(PetscObjectComm((PetscObject)pc),731,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",73,PETSC_ERROR_INITIAL
,"Must provide interpolation or restriction for each MG level except level 0"
);

732

if (!mglevels[i+1]->interpolate) {

733

ierr = PCMGSetInterpolation(pc,i+1,mglevels[i+1]->restrct);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),733,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

734

}

735

if (!mglevels[i+1]->restrct) {

736

ierr = PCMGSetRestriction(pc,i+1,mglevels[i+1]->interpolate);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),736,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

737

}

738

if (reuse == MAT_REUSE_MATRIX) {

739

ierr = KSPGetOperators(mglevels[i]->smoothd,&A,&B);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),739,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

740

}

741

if (doA) {

742

ierr = MatGalerkin(mglevels[i+1]->restrct,dA,mglevels[i+1]->interpolate,reuse,1.0,&A);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),742,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

743

}

744

if (doB) {

745

ierr = MatGalerkin(mglevels[i+1]->restrct,dB,mglevels[i+1]->interpolate,reuse,1.0,&B);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),745,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

746

}

747

/* the management of the PetscObjectReference() and PetscObjecDereference() below is rather delicate */

748

if (!doA && dAeqdB) {

749

if (reuse == MAT_INITIAL_MATRIX) {ierr = PetscObjectReference((PetscObject)B);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),749,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

750

A = B;

751

} else if (!doA && reuse == MAT_INITIAL_MATRIX ) {

752

ierr = KSPGetOperators(mglevels[i]->smoothd,&A,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),752,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

753

ierr = PetscObjectReference((PetscObject)A);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),753,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

754

}

755

if (!doB && dAeqdB) {

756

if (reuse == MAT_INITIAL_MATRIX) {ierr = PetscObjectReference((PetscObject)A);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),756,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

757

B = A;

758

} else if (!doB && reuse == MAT_INITIAL_MATRIX) {

759

ierr = KSPGetOperators(mglevels[i]->smoothd,NULL((void*)0),&B);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),759,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

760

ierr = PetscObjectReference((PetscObject)B);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),760,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

761

}

762

if (reuse == MAT_INITIAL_MATRIX) {

763

ierr = KSPSetOperators(mglevels[i]->smoothd,A,B);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),763,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

764

ierr = PetscObjectDereference((PetscObject)A);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),764,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

765

ierr = PetscObjectDereference((PetscObject)B);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),765,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

766

}

767

dA = A;

768

dB = B;

769

}

770

}

771

if (needRestricts && pc->dm && pc->dm->x) {

772

/* need to restrict Jacobian location to coarser meshes for evaluation */

773

for (i=n-2; i>-1; i--) {

774

Mat R;

775

Vec rscale;

776

if (!mglevels[i]->smoothd->dm->x) {

777

Vec *vecs;

778

ierr = KSPCreateVecs(mglevels[i]->smoothd,1,&vecs,0,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),778,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

779

mglevels[i]->smoothd->dm->x = vecs[0];

780

ierr = PetscFree(vecs)((*PetscTrFree)((void*)(vecs),780,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((vecs) = 0,0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),780,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

781

}

782

ierr = PCMGGetRestriction(pc,i+1,&R);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),782,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

783

ierr = PCMGGetRScale(pc,i+1,&rscale);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),783,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

784

ierr = MatRestrict(R,mglevels[i+1]->smoothd->dm->x,mglevels[i]->smoothd->dm->x);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),784,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

785

ierr = VecPointwiseMult(mglevels[i]->smoothd->dm->x,mglevels[i]->smoothd->dm->x,rscale);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),785,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

786

}

787

}

788

if (needRestricts && pc->dm) {

789

for (i=n-2; i>=0; i--) {

790

DM dmfine,dmcoarse;

791

Mat Restrict,Inject;

792

Vec rscale;

793

ierr = KSPGetDM(mglevels[i+1]->smoothd,&dmfine);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),793,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

794

ierr = KSPGetDM(mglevels[i]->smoothd,&dmcoarse);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),794,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

795

ierr = PCMGGetRestriction(pc,i+1,&Restrict);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),795,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

796

ierr = PCMGGetRScale(pc,i+1,&rscale);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),796,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

797

ierr = PCMGGetInjection(pc,i+1,&Inject);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),797,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

798

ierr = DMRestrict(dmfine,Restrict,rscale,Inject,dmcoarse);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),798,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

799

}

800

}

801

802

if (!pc->setupcalled) {

803

for (i=0; i<n; i++) {

804

ierr = KSPSetFromOptions(mglevels[i]->smoothd);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),804,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

805

}

806

for (i=1; i<n; i++) {

807

if (mglevels[i]->smoothu && (mglevels[i]->smoothu != mglevels[i]->smoothd)) {

808

ierr = KSPSetFromOptions(mglevels[i]->smoothu);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),808,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

809

}

810

}

811

/* insure that if either interpolation or restriction is set the other other one is set */

812

for (i=1; i<n; i++) {

813

ierr = PCMGGetInterpolation(pc,i,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),813,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

814

ierr = PCMGGetRestriction(pc,i,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),814,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

815

}

816

for (i=0; i<n-1; i++) {

817

if (!mglevels[i]->b) {

818

Vec *vec;

819

ierr = KSPCreateVecs(mglevels[i]->smoothd,1,&vec,0,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),819,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

820

ierr = PCMGSetRhs(pc,i,*vec);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),820,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

821

ierr = VecDestroy(vec);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),821,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

822

ierr = PetscFree(vec)((*PetscTrFree)((void*)(vec),822,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((vec) = 0,0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),822,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

823

}

824

if (!mglevels[i]->r && i) {

825

ierr = VecDuplicate(mglevels[i]->b,&tvec);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),825,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

826

ierr = PCMGSetR(pc,i,tvec);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),826,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

827

ierr = VecDestroy(&tvec);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),827,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

828

}

829

if (!mglevels[i]->x) {

830

ierr = VecDuplicate(mglevels[i]->b,&tvec);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),830,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

831

ierr = PCMGSetX(pc,i,tvec);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),831,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

832

ierr = VecDestroy(&tvec);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),832,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

833

}

834

}

835

if (n != 1 && !mglevels[n-1]->r) {

836

/* PCMGSetR() on the finest level if user did not supply it */

837

Vec *vec;

838

ierr = KSPCreateVecs(mglevels[n-1]->smoothd,1,&vec,0,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),838,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

839

ierr = PCMGSetR(pc,n-1,*vec);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),839,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

840

ierr = VecDestroy(vec);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),840,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

841

ierr = PetscFree(vec)((*PetscTrFree)((void*)(vec),841,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((vec) = 0,0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),841,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

842

}

843

}

844

845

if (pc->dm) {

846

/* need to tell all the coarser levels to rebuild the matrix using the DM for that level */

847

for (i=0; i<n-1; i++) {

848

if (mglevels[i]->smoothd->setupstage != KSP_SETUP_NEW) mglevels[i]->smoothd->setupstage = KSP_SETUP_NEWMATRIX;

849

}

850

}

851

852

for (i=1; i<n; i++) {

853

if (mglevels[i]->smoothu == mglevels[i]->smoothd || mg->am == PC_MG_FULL || mg->am == PC_MG_KASKADE || mg->cyclesperpcapply > 1){

854

/* if doing only down then initial guess is zero */

855

ierr = KSPSetInitialGuessNonzero(mglevels[i]->smoothd,PETSC_TRUE);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),855,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

856

}

857

if (mglevels[i]->eventsmoothsetup) {ierr = PetscLogEventBegin(mglevels[i]->eventsmoothsetup,0,0,0,0)(((PetscLogPLB && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels[i]->eventsmoothsetup].active) ? (*PetscLogPLB)((
mglevels[i]->eventsmoothsetup),0,(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),857,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

858

ierr = KSPSetUp(mglevels[i]->smoothd);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),858,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

859

if (mglevels[i]->smoothd->reason == KSP_DIVERGED_PC_FAILED) {

860

pc->failedreason = PC_SUBPC_ERROR;

861

}

862

if (mglevels[i]->eventsmoothsetup) {ierr = PetscLogEventEnd(mglevels[i]->eventsmoothsetup,0,0,0,0)(((PetscLogPLE && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels[i]->eventsmoothsetup].active) ? (*PetscLogPLE)((
mglevels[i]->eventsmoothsetup),0,(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),862,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

863

if (!mglevels[i]->residual) {

864

Mat mat;

865

ierr = KSPGetOperators(mglevels[i]->smoothd,&mat,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),865,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

866

ierr = PCMGSetResidual(pc,i,PCMGResidualDefault,mat);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),866,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

867

}

868

}

869

for (i=1; i<n; i++) {

870

if (mglevels[i]->smoothu && mglevels[i]->smoothu != mglevels[i]->smoothd) {

871

Mat downmat,downpmat;

872

873

/* check if operators have been set for up, if not use down operators to set them */

874

ierr = KSPGetOperatorsSet(mglevels[i]->smoothu,&opsset,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),874,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

875

if (!opsset) {

876

ierr = KSPGetOperators(mglevels[i]->smoothd,&downmat,&downpmat);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),876,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

877

ierr = KSPSetOperators(mglevels[i]->smoothu,downmat,downpmat);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),877,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

878

}

879

880

ierr = KSPSetInitialGuessNonzero(mglevels[i]->smoothu,PETSC_TRUE);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),880,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

881

if (mglevels[i]->eventsmoothsetup) {ierr = PetscLogEventBegin(mglevels[i]->eventsmoothsetup,0,0,0,0)(((PetscLogPLB && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels[i]->eventsmoothsetup].active) ? (*PetscLogPLB)((
mglevels[i]->eventsmoothsetup),0,(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),881,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

882

ierr = KSPSetUp(mglevels[i]->smoothu);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),882,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

883

if (mglevels[i]->smoothu->reason == KSP_DIVERGED_PC_FAILED) {

884

pc->failedreason = PC_SUBPC_ERROR;

885

}

886

if (mglevels[i]->eventsmoothsetup) {ierr = PetscLogEventEnd(mglevels[i]->eventsmoothsetup,0,0,0,0)(((PetscLogPLE && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels[i]->eventsmoothsetup].active) ? (*PetscLogPLE)((
mglevels[i]->eventsmoothsetup),0,(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),886,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

887

}

888

}

889

890

if (mglevels[0]->eventsmoothsetup) {ierr = PetscLogEventBegin(mglevels[0]->eventsmoothsetup,0,0,0,0)(((PetscLogPLB && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels[0]->eventsmoothsetup].active) ? (*PetscLogPLB)((
mglevels[0]->eventsmoothsetup),0,(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),890,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

891

ierr = KSPSetUp(mglevels[0]->smoothd);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),891,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

892

if (mglevels[0]->smoothd->reason == KSP_DIVERGED_PC_FAILED) {

893

pc->failedreason = PC_SUBPC_ERROR;

894

}

895

if (mglevels[0]->eventsmoothsetup) {ierr = PetscLogEventEnd(mglevels[0]->eventsmoothsetup,0,0,0,0)(((PetscLogPLE && petsc_stageLog->stageInfo[petsc_stageLog
->curStage].perfInfo.active && petsc_stageLog->
stageInfo[petsc_stageLog->curStage].eventLog->eventInfo
[mglevels[0]->eventsmoothsetup].active) ? (*PetscLogPLE)((
mglevels[0]->eventsmoothsetup),0,(PetscObject)(0),(PetscObject
)(0),(PetscObject)(0),(PetscObject)(0)) : 0 ));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),895,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);}

896

897

898

Dump the interpolation/restriction matrices plus the

899

Jacobian/stiffness on each level. This allows MATLAB users to

900

easily check if the Galerkin condition A_c = R A_f R^T is satisfied.

901

902

Only support one or the other at the same time.

903

904

#if defined(PETSC_USE_SOCKET_VIEWER1)

905

ierr = PetscOptionsGetBool(((PetscObject)pc)->options,((PetscObject)pc)->prefix,"-pc_mg_dump_matlab",&dump,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),905,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

906

if (dump) viewer = PETSC_VIEWER_SOCKET_(PetscObjectComm((PetscObject)pc));

907

dump = PETSC_FALSE;

908

#endif

909

ierr = PetscOptionsGetBool(((PetscObject)pc)->options,((PetscObject)pc)->prefix,"-pc_mg_dump_binary",&dump,NULL((void*)0));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),909,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

910

if (dump) viewer = PETSC_VIEWER_BINARY_(PetscObjectComm((PetscObject)pc));

911

912

if (viewer) {

913

for (i=1; i<n; i++) {

914

ierr = MatView(mglevels[i]->restrct,viewer);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),914,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

915

}

916

for (i=0; i<n; i++) {

917

ierr = KSPGetPC(mglevels[i]->smoothd,&pc);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),917,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

918

ierr = MatView(pc->mat,viewer);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),918,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

919

}

920

}

921

922

}

923

924

/* -------------------------------------------------------------------------------------*/

925

926

PetscErrorCode PCMGGetLevels_MG(PC pc, PetscInt *levels)

927

{

928

PC_MG *mg = (PC_MG *) pc->data;

929

930

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 930; petscstack->petscroutine
[petscstack->currentsize] = PETSC_TRUE; petscstack->currentsize
++; } if (petscstack) { petscstack->hotdepth += (PETSC_FALSE
|| petscstack->hotdepth); } ; } while (0); ; } while (0);

931

*levels = mg->nlevels;

932

933

}

934

935

/*@

936

PCMGGetLevels - Gets the number of levels to use with MG.

937

938

Not Collective

939

940

Input Parameter:

941

. pc - the preconditioner context

942

943

Output parameter:

944

. levels - the number of levels

945

946

Level: advanced

947

948

.seealso: PCMGSetLevels()

949

@*/

950

PetscErrorCode PCMGGetLevels(PC pc,PetscInt *levels)

951

{

952

PetscErrorCode ierr;

953

954

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 954; petscstack->petscroutine
[petscstack->currentsize] = PETSC_TRUE; petscstack->currentsize
++; } if (petscstack) { petscstack->hotdepth += (PETSC_FALSE
|| petscstack->hotdepth); } ; } while (0); ; } while (0);

955

PetscValidHeaderSpecific(pc,PC_CLASSID,1)do { if (!pc) return PetscError(((MPI_Comm)0x44000001),955,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",85,PETSC_ERROR_INITIAL
,"Null Object: Parameter # %d",1); if (!PetscCheckPointer(pc,
PETSC_OBJECT)) return PetscError(((MPI_Comm)0x44000001),955,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",64,PETSC_ERROR_INITIAL
,"Invalid Pointer to Object: Parameter # %d",1); if (((PetscObject
)(pc))->classid != PC_CLASSID) { if (((PetscObject)(pc))->
classid == -1) return PetscError(((MPI_Comm)0x44000001),955,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",64,PETSC_ERROR_INITIAL
,"Object already free: Parameter # %d",1); else return PetscError
(((MPI_Comm)0x44000001),955,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,62,PETSC_ERROR_INITIAL,"Wrong type of object: Parameter # %d"
,1); } } while (0);

956

PetscValidIntPointer(levels,2)do { if (!levels) return PetscError(((MPI_Comm)0x44000001),956
,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,68,PETSC_ERROR_INITIAL,"Null Pointer: Parameter # %d",2); if
(!PetscCheckPointer(levels,PETSC_INT)) return PetscError(((MPI_Comm
)0x44000001),956,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,68,PETSC_ERROR_INITIAL,"Invalid Pointer to PetscInt: Parameter # %d"
,2); } while (0);

957

*levels = 0;

958

ierr = PetscTryMethod(pc,"PCMGGetLevels_C",(PC,PetscInt*),(pc,levels))0; do { PetscErrorCode (*_7_f)(PC,PetscInt*), _7_ierr; _7_ierr
= PetscObjectQueryFunction_Private(((PetscObject)(pc)),("PCMGGetLevels_C"
),(PetscVoidFunction*)(&_7_f));do {if (__builtin_expect(!
!(_7_ierr),0)) return PetscError(((MPI_Comm)0x44000001),958,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",_7_ierr
,PETSC_ERROR_REPEAT," ");} while (0); if (_7_f) {_7_ierr = (*
_7_f)(pc,levels);do {if (__builtin_expect(!!(_7_ierr),0)) return
PetscError(((MPI_Comm)0x44000001),958,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,_7_ierr,PETSC_ERROR_REPEAT," ");} while (0);} } while(0);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),958,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

959

960

}

961

962

/*@

963

PCMGSetType - Determines the form of multigrid to use:

964

multiplicative, additive, full, or the Kaskade algorithm.

965

966

Logically Collective on PC

967

968

Input Parameters:

969

+ pc - the preconditioner context

970

- form - multigrid form, one of PC_MG_MULTIPLICATIVE, PC_MG_ADDITIVE,

971

PC_MG_FULL, PC_MG_KASKADE

972

973

Options Database Key:

974

. -pc_mg_type <form> - Sets <form>, one of multiplicative,

975

additive, full, kaskade

976

977

Level: advanced

978

979

.seealso: PCMGSetLevels()

980

@*/

981

PetscErrorCode PCMGSetType(PC pc,PCMGType form)

982

{

983

PC_MG *mg = (PC_MG*)pc->data;

984

985

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 985; petscstack->petscroutine
[petscstack->currentsize] = PETSC_TRUE; petscstack->currentsize
++; } if (petscstack) { petscstack->hotdepth += (PETSC_FALSE
|| petscstack->hotdepth); } ; } while (0); ; } while (0);

986

PetscValidHeaderSpecific(pc,PC_CLASSID,1)do { if (!pc) return PetscError(((MPI_Comm)0x44000001),986,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",85,PETSC_ERROR_INITIAL
,"Null Object: Parameter # %d",1); if (!PetscCheckPointer(pc,
PETSC_OBJECT)) return PetscError(((MPI_Comm)0x44000001),986,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",64,PETSC_ERROR_INITIAL
,"Invalid Pointer to Object: Parameter # %d",1); if (((PetscObject
)(pc))->classid != PC_CLASSID) { if (((PetscObject)(pc))->
classid == -1) return PetscError(((MPI_Comm)0x44000001),986,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",64,PETSC_ERROR_INITIAL
,"Object already free: Parameter # %d",1); else return PetscError
(((MPI_Comm)0x44000001),986,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,62,PETSC_ERROR_INITIAL,"Wrong type of object: Parameter # %d"
,1); } } while (0);

987

PetscValidLogicalCollectiveEnum(pc,form,2)do { PetscErrorCode _7_ierr; PetscMPIInt b1[2],b2[2]; b1[0] =
-(PetscMPIInt)form; b1[1] = (PetscMPIInt)form; _7_ierr = (PetscAllreduceBarrierCheck
(PetscObjectComm((PetscObject)pc),2,987,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((petsc_allreduce_ct += PetscMPIParallelComm((PetscObjectComm
((PetscObject)pc))),0) || MPI_Allreduce((b1),(b2),(2),(((MPI_Datatype
)0x4c000405)),((MPI_Op)(0x58000001)),(PetscObjectComm((PetscObject
)pc)))));do {if (__builtin_expect(!!(_7_ierr),0)) return PetscError
(((MPI_Comm)0x44000001),987,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,_7_ierr,PETSC_ERROR_REPEAT," ");} while (0); if (-b2[0] != b2
[1]) return PetscError(PetscObjectComm((PetscObject)pc),987,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",62,PETSC_ERROR_INITIAL
,"Enum value must be same on all processes, argument # %d",2)
; } while (0);

988

mg->am = form;

989

if (form == PC_MG_MULTIPLICATIVE) pc->ops->applyrichardson = PCApplyRichardson_MG;

990

else pc->ops->applyrichardson = NULL((void*)0);

991

992

}

993

994

/*@

995

PCMGGetType - Determines the form of multigrid to use:

996

multiplicative, additive, full, or the Kaskade algorithm.

997

998

Logically Collective on PC

999

1000

Input Parameter:

1001

. pc - the preconditioner context

1002

1003

Output Parameter:

1004

. type - one of PC_MG_MULTIPLICATIVE, PC_MG_ADDITIVE,PC_MG_FULL, PC_MG_KASKADE

1005

1006

1007

Level: advanced

1008

1009

.seealso: PCMGSetLevels()

1010

@*/

1011

PetscErrorCode PCMGGetType(PC pc,PCMGType *type)

1012

{

1013

PC_MG *mg = (PC_MG*)pc->data;

1014

1015

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 1015; petscstack->
petscroutine[petscstack->currentsize] = PETSC_TRUE; petscstack
->currentsize++; } if (petscstack) { petscstack->hotdepth
+= (PETSC_FALSE || petscstack->hotdepth); } ; } while (0)
; ; } while (0);

1016

PetscValidHeaderSpecific(pc,PC_CLASSID,1)do { if (!pc) return PetscError(((MPI_Comm)0x44000001),1016,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",85,PETSC_ERROR_INITIAL
,"Null Object: Parameter # %d",1); if (!PetscCheckPointer(pc,
PETSC_OBJECT)) return PetscError(((MPI_Comm)0x44000001),1016,
__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,64,PETSC_ERROR_INITIAL,"Invalid Pointer to Object: Parameter # %d"
,1); if (((PetscObject)(pc))->classid != PC_CLASSID) { if (
((PetscObject)(pc))->classid == -1) return PetscError(((MPI_Comm
)0x44000001),1016,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,64,PETSC_ERROR_INITIAL,"Object already free: Parameter # %d"
,1); else return PetscError(((MPI_Comm)0x44000001),1016,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",62,PETSC_ERROR_INITIAL
,"Wrong type of object: Parameter # %d",1); } } while (0);

1017

*type = mg->am;

1018

1019

}

1020

1021

/*@

1022

PCMGSetCycleType - Sets the type cycles to use. Use PCMGSetCycleTypeOnLevel() for more

1023

complicated cycling.

1024

1025

Logically Collective on PC

1026

1027

Input Parameters:

1028

+ pc - the multigrid context

1029

- n - either PC_MG_CYCLE_V or PC_MG_CYCLE_W

1030

1031

Options Database Key:

1032

. -pc_mg_cycle_type <v,w> - provide the cycle desired

1033

1034

Level: advanced

1035

1036

.seealso: PCMGSetCycleTypeOnLevel()

1037

@*/

1038

PetscErrorCode PCMGSetCycleType(PC pc,PCMGCycleType n)

1039

{

1040

PC_MG *mg = (PC_MG*)pc->data;

1041

PC_MG_Levels **mglevels = mg->levels;

1042

PetscInt i,levels;

1043

1044

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 1044; petscstack->
petscroutine[petscstack->currentsize] = PETSC_TRUE; petscstack
->currentsize++; } if (petscstack) { petscstack->hotdepth
+= (PETSC_FALSE || petscstack->hotdepth); } ; } while (0)
; ; } while (0);

1045

PetscValidHeaderSpecific(pc,PC_CLASSID,1)do { if (!pc) return PetscError(((MPI_Comm)0x44000001),1045,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",85,PETSC_ERROR_INITIAL
,"Null Object: Parameter # %d",1); if (!PetscCheckPointer(pc,
PETSC_OBJECT)) return PetscError(((MPI_Comm)0x44000001),1045,
__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,64,PETSC_ERROR_INITIAL,"Invalid Pointer to Object: Parameter # %d"
,1); if (((PetscObject)(pc))->classid != PC_CLASSID) { if (
((PetscObject)(pc))->classid == -1) return PetscError(((MPI_Comm
)0x44000001),1045,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,64,PETSC_ERROR_INITIAL,"Object already free: Parameter # %d"
,1); else return PetscError(((MPI_Comm)0x44000001),1045,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",62,PETSC_ERROR_INITIAL
,"Wrong type of object: Parameter # %d",1); } } while (0);

1046

PetscValidLogicalCollectiveEnum(pc,n,2)do { PetscErrorCode _7_ierr; PetscMPIInt b1[2],b2[2]; b1[0] =
-(PetscMPIInt)n; b1[1] = (PetscMPIInt)n; _7_ierr = (PetscAllreduceBarrierCheck
(PetscObjectComm((PetscObject)pc),2,1046,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((petsc_allreduce_ct += PetscMPIParallelComm((PetscObjectComm
((PetscObject)pc))),0) || MPI_Allreduce((b1),(b2),(2),(((MPI_Datatype
)0x4c000405)),((MPI_Op)(0x58000001)),(PetscObjectComm((PetscObject
)pc)))));do {if (__builtin_expect(!!(_7_ierr),0)) return PetscError
(((MPI_Comm)0x44000001),1046,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,_7_ierr,PETSC_ERROR_REPEAT," ");} while (0); if (-b2[0] != b2
[1]) return PetscError(PetscObjectComm((PetscObject)pc),1046,
__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,62,PETSC_ERROR_INITIAL,"Enum value must be same on all processes, argument # %d"
,2); } while (0);

1047

if (!mglevels) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_ORDER,"Must set MG levels with PCMGSetLevels() before calling")return PetscError(PetscObjectComm((PetscObject)pc),1047,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",58,PETSC_ERROR_INITIAL
,"Must set MG levels with PCMGSetLevels() before calling");

1048

levels = mglevels[0]->levels;

1049

for (i=0; i<levels; i++) mglevels[i]->cycles = n;

1050

1051

}

1052

1053

/*@

1054

PCMGMultiplicativeSetCycles - Sets the number of cycles to use for each preconditioner step

1055

of multigrid when PCMGType of PC_MG_MULTIPLICATIVE is used

1056

1057

Logically Collective on PC

1058

1059

Input Parameters:

1060

+ pc - the multigrid context

1061

- n - number of cycles (default is 1)

1062

1063

Options Database Key:

1064

. -pc_mg_multiplicative_cycles n

1065

1066

Level: advanced

1067

1068

Notes:

1069

This is not associated with setting a v or w cycle, that is set with PCMGSetCycleType()

1070

1071

.seealso: PCMGSetCycleTypeOnLevel(), PCMGSetCycleType()

1072

@*/

1073

PetscErrorCode PCMGMultiplicativeSetCycles(PC pc,PetscInt n)

1074

{

1075

PC_MG *mg = (PC_MG*)pc->data;

1076

1077

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 1077; petscstack->
petscroutine[petscstack->currentsize] = PETSC_TRUE; petscstack
->currentsize++; } if (petscstack) { petscstack->hotdepth
+= (PETSC_FALSE || petscstack->hotdepth); } ; } while (0)
; ; } while (0);

1078

PetscValidHeaderSpecific(pc,PC_CLASSID,1)do { if (!pc) return PetscError(((MPI_Comm)0x44000001),1078,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",85,PETSC_ERROR_INITIAL
,"Null Object: Parameter # %d",1); if (!PetscCheckPointer(pc,
PETSC_OBJECT)) return PetscError(((MPI_Comm)0x44000001),1078,
__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,64,PETSC_ERROR_INITIAL,"Invalid Pointer to Object: Parameter # %d"
,1); if (((PetscObject)(pc))->classid != PC_CLASSID) { if (
((PetscObject)(pc))->classid == -1) return PetscError(((MPI_Comm
)0x44000001),1078,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,64,PETSC_ERROR_INITIAL,"Object already free: Parameter # %d"
,1); else return PetscError(((MPI_Comm)0x44000001),1078,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",62,PETSC_ERROR_INITIAL
,"Wrong type of object: Parameter # %d",1); } } while (0);

1079

PetscValidLogicalCollectiveInt(pc,n,2)do { PetscErrorCode _7_ierr; PetscInt b1[2],b2[2]; b1[0] = -n
; b1[1] = n; _7_ierr = (PetscAllreduceBarrierCheck(PetscObjectComm
((PetscObject)pc),2,1079,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((petsc_allreduce_ct += PetscMPIParallelComm((PetscObjectComm
((PetscObject)pc))),0) || MPI_Allreduce((b1),(b2),(2),(((MPI_Datatype
)0x4c000405)),((MPI_Op)(0x58000001)),(PetscObjectComm((PetscObject
)pc)))));do {if (__builtin_expect(!!(_7_ierr),0)) return PetscError
(((MPI_Comm)0x44000001),1079,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,_7_ierr,PETSC_ERROR_REPEAT," ");} while (0); if (-b2[0] != b2
[1]) return PetscError(PetscObjectComm((PetscObject)pc),1079,
__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,62,PETSC_ERROR_INITIAL,"Int value must be same on all processes, argument # %d"
,2); } while (0);

1080

mg->cyclesperpcapply = n;

1081

1082

}

1083

1084

PetscErrorCode PCMGSetGalerkin_MG(PC pc,PCMGGalerkinType use)

1085

{

1086

PC_MG *mg = (PC_MG*)pc->data;

1087

1088

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 1088; petscstack->
petscroutine[petscstack->currentsize] = PETSC_TRUE; petscstack
->currentsize++; } if (petscstack) { petscstack->hotdepth
+= (PETSC_FALSE || petscstack->hotdepth); } ; } while (0)
; ; } while (0);

1089

mg->galerkin = use;

1090

1091

}

1092

1093

/*@

1094

PCMGSetGalerkin - Causes the coarser grid matrices to be computed from the

1095

finest grid via the Galerkin process: A_i-1 = r_i * A_i * p_i

1096

1097

Logically Collective on PC

1098

1099

Input Parameters:

1100

+ pc - the multigrid context

1101

- use - one of PC_MG_GALERKIN_BOTH,PC_MG_GALERKIN_PMAT,PC_MG_GALERKIN_MAT, or PC_MG_GALERKIN_NONE

1102

1103

Options Database Key:

1104

. -pc_mg_galerkin <both,pmat,mat,none>

1105

1106

Level: intermediate

1107

1108

Notes:

1109

Some codes that use PCMG such as PCGAMG use Galerkin internally while constructing the hierarchy and thus do not

1110

use the PCMG construction of the coarser grids.

1111

1112

.seealso: PCMGGetGalerkin(), PCMGGalerkinType

1113

1114

@*/

1115

PetscErrorCode PCMGSetGalerkin(PC pc,PCMGGalerkinType use)

1116

{

1117

PetscErrorCode ierr;

1118

1119

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 1119; petscstack->
petscroutine[petscstack->currentsize] = PETSC_TRUE; petscstack
->currentsize++; } if (petscstack) { petscstack->hotdepth
+= (PETSC_FALSE || petscstack->hotdepth); } ; } while (0)
; ; } while (0);

1120

PetscValidHeaderSpecific(pc,PC_CLASSID,1)do { if (!pc) return PetscError(((MPI_Comm)0x44000001),1120,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",85,PETSC_ERROR_INITIAL
,"Null Object: Parameter # %d",1); if (!PetscCheckPointer(pc,
PETSC_OBJECT)) return PetscError(((MPI_Comm)0x44000001),1120,
__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,64,PETSC_ERROR_INITIAL,"Invalid Pointer to Object: Parameter # %d"
,1); if (((PetscObject)(pc))->classid != PC_CLASSID) { if (
((PetscObject)(pc))->classid == -1) return PetscError(((MPI_Comm
)0x44000001),1120,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,64,PETSC_ERROR_INITIAL,"Object already free: Parameter # %d"
,1); else return PetscError(((MPI_Comm)0x44000001),1120,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",62,PETSC_ERROR_INITIAL
,"Wrong type of object: Parameter # %d",1); } } while (0);

1121

ierr = PetscTryMethod(pc,"PCMGSetGalerkin_C",(PC,PCMGGalerkinType),(pc,use))0; do { PetscErrorCode (*_7_f)(PC,PCMGGalerkinType), _7_ierr;
_7_ierr = PetscObjectQueryFunction_Private(((PetscObject)(pc
)),("PCMGSetGalerkin_C"),(PetscVoidFunction*)(&_7_f));do {
if (__builtin_expect(!!(_7_ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1121,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,_7_ierr,PETSC_ERROR_REPEAT," ");} while (0); if (_7_f) {_7_ierr
= (*_7_f)(pc,use);do {if (__builtin_expect(!!(_7_ierr),0)) return
PetscError(((MPI_Comm)0x44000001),1121,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,_7_ierr,PETSC_ERROR_REPEAT," ");} while (0);} } while(0);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1121,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1122

1123

}

1124

1125

/*@

1126

PCMGGetGalerkin - Checks if Galerkin multigrid is being used, i.e.

1127

A_i-1 = r_i * A_i * p_i

1128

1129

Not Collective

1130

1131

Input Parameter:

1132

. pc - the multigrid context

1133

1134

Output Parameter:

1135

. galerkin - one of PC_MG_GALERKIN_BOTH,PC_MG_GALERKIN_PMAT,PC_MG_GALERKIN_MAT, PC_MG_GALERKIN_NONE, or PC_MG_GALERKIN_EXTERNAL

1136

1137

Level: intermediate

1138

1139

.seealso: PCMGSetGalerkin(), PCMGGalerkinType

1140

1141

@*/

1142

PetscErrorCode PCMGGetGalerkin(PC pc,PCMGGalerkinType *galerkin)

1143

{

1144

PC_MG *mg = (PC_MG*)pc->data;

1145

1146

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 1146; petscstack->
petscroutine[petscstack->currentsize] = PETSC_TRUE; petscstack
->currentsize++; } if (petscstack) { petscstack->hotdepth
+= (PETSC_FALSE || petscstack->hotdepth); } ; } while (0)
; ; } while (0);

1147

PetscValidHeaderSpecific(pc,PC_CLASSID,1)do { if (!pc) return PetscError(((MPI_Comm)0x44000001),1147,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",85,PETSC_ERROR_INITIAL
,"Null Object: Parameter # %d",1); if (!PetscCheckPointer(pc,
PETSC_OBJECT)) return PetscError(((MPI_Comm)0x44000001),1147,
__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,64,PETSC_ERROR_INITIAL,"Invalid Pointer to Object: Parameter # %d"
,1); if (((PetscObject)(pc))->classid != PC_CLASSID) { if (
((PetscObject)(pc))->classid == -1) return PetscError(((MPI_Comm
)0x44000001),1147,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,64,PETSC_ERROR_INITIAL,"Object already free: Parameter # %d"
,1); else return PetscError(((MPI_Comm)0x44000001),1147,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",62,PETSC_ERROR_INITIAL
,"Wrong type of object: Parameter # %d",1); } } while (0);

1148

*galerkin = mg->galerkin;

1149

1150

}

1151

1152

/*@

1153

PCMGSetNumberSmooth - Sets the number of pre and post-smoothing steps to use

1154

on all levels. Use PCMGDistinctSmoothUp() to create separate up and down smoothers if you want different numbers of

1155

pre- and post-smoothing steps.

1156

1157

Logically Collective on PC

1158

1159

Input Parameters:

1160

+ mg - the multigrid context

1161

- n - the number of smoothing steps

1162

1163

Options Database Key:

1164

. -mg_levels_ksp_max_it <n> - Sets number of pre and post-smoothing steps

1165

1166

Level: advanced

1167

1168

Notes:

1169

this does not set a value on the coarsest grid, since we assume that

1170

there is no separate smooth up on the coarsest grid.

1171

1172

.seealso: PCMGSetDistinctSmoothUp()

1173

@*/

1174

PetscErrorCode PCMGSetNumberSmooth(PC pc,PetscInt n)

1175

{

1176

PC_MG *mg = (PC_MG*)pc->data;

1177

PC_MG_Levels **mglevels = mg->levels;

1178

PetscErrorCode ierr;

1179

PetscInt i,levels;

1180

1181

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 1181; petscstack->
petscroutine[petscstack->currentsize] = PETSC_TRUE; petscstack
->currentsize++; } if (petscstack) { petscstack->hotdepth
+= (PETSC_FALSE || petscstack->hotdepth); } ; } while (0)
; ; } while (0);

1182

PetscValidHeaderSpecific(pc,PC_CLASSID,1)do { if (!pc) return PetscError(((MPI_Comm)0x44000001),1182,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",85,PETSC_ERROR_INITIAL
,"Null Object: Parameter # %d",1); if (!PetscCheckPointer(pc,
PETSC_OBJECT)) return PetscError(((MPI_Comm)0x44000001),1182,
__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,64,PETSC_ERROR_INITIAL,"Invalid Pointer to Object: Parameter # %d"
,1); if (((PetscObject)(pc))->classid != PC_CLASSID) { if (
((PetscObject)(pc))->classid == -1) return PetscError(((MPI_Comm
)0x44000001),1182,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,64,PETSC_ERROR_INITIAL,"Object already free: Parameter # %d"
,1); else return PetscError(((MPI_Comm)0x44000001),1182,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",62,PETSC_ERROR_INITIAL
,"Wrong type of object: Parameter # %d",1); } } while (0);

1183

PetscValidLogicalCollectiveInt(pc,n,2)do { PetscErrorCode _7_ierr; PetscInt b1[2],b2[2]; b1[0] = -n
; b1[1] = n; _7_ierr = (PetscAllreduceBarrierCheck(PetscObjectComm
((PetscObject)pc),2,1183,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
) || ((petsc_allreduce_ct += PetscMPIParallelComm((PetscObjectComm
((PetscObject)pc))),0) || MPI_Allreduce((b1),(b2),(2),(((MPI_Datatype
)0x4c000405)),((MPI_Op)(0x58000001)),(PetscObjectComm((PetscObject
)pc)))));do {if (__builtin_expect(!!(_7_ierr),0)) return PetscError
(((MPI_Comm)0x44000001),1183,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,_7_ierr,PETSC_ERROR_REPEAT," ");} while (0); if (-b2[0] != b2
[1]) return PetscError(PetscObjectComm((PetscObject)pc),1183,
__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,62,PETSC_ERROR_INITIAL,"Int value must be same on all processes, argument # %d"
,2); } while (0);

1184

if (!mglevels) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_ORDER,"Must set MG levels with PCMGSetLevels() before calling")return PetscError(PetscObjectComm((PetscObject)pc),1184,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",58,PETSC_ERROR_INITIAL
,"Must set MG levels with PCMGSetLevels() before calling");

1185

levels = mglevels[0]->levels;

1186

1187

for (i=1; i<levels; i++) {

1188

ierr = KSPSetTolerances(mglevels[i]->smoothu,PETSC_DEFAULT-2,PETSC_DEFAULT-2,PETSC_DEFAULT-2,n);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1188,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1189

ierr = KSPSetTolerances(mglevels[i]->smoothd,PETSC_DEFAULT-2,PETSC_DEFAULT-2,PETSC_DEFAULT-2,n);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1189,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1190

mg->default_smoothu = n;

1191

mg->default_smoothd = n;

1192

}

1193

1194

}

1195

1196

/*@

1197

PCMGSetDistinctSmoothUp - sets the up (post) smoother to be a seperate KSP from the down (pre) smoother on all levels

1198

and adds the suffix _up to the options name

1199

1200

Logically Collective on PC

1201

1202

Input Parameters:

1203

. pc - the preconditioner context

1204

1205

Options Database Key:

1206

. -pc_mg_distinct_smoothup

1207

1208

Level: advanced

1209

1210

Notes:

1211

this does not set a value on the coarsest grid, since we assume that

1212

there is no separate smooth up on the coarsest grid.

1213

1214

.seealso: PCMGSetNumberSmooth()

1215

@*/

1216

PetscErrorCode PCMGSetDistinctSmoothUp(PC pc)

1217

{

1218

PC_MG *mg = (PC_MG*)pc->data;

1219

PC_MG_Levels **mglevels = mg->levels;

1220

PetscErrorCode ierr;

1221

PetscInt i,levels;

1222

KSP subksp;

1223

1224

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 1224; petscstack->
petscroutine[petscstack->currentsize] = PETSC_TRUE; petscstack
->currentsize++; } if (petscstack) { petscstack->hotdepth
+= (PETSC_FALSE || petscstack->hotdepth); } ; } while (0)
; ; } while (0);

1225

PetscValidHeaderSpecific(pc,PC_CLASSID,1)do { if (!pc) return PetscError(((MPI_Comm)0x44000001),1225,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",85,PETSC_ERROR_INITIAL
,"Null Object: Parameter # %d",1); if (!PetscCheckPointer(pc,
PETSC_OBJECT)) return PetscError(((MPI_Comm)0x44000001),1225,
__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,64,PETSC_ERROR_INITIAL,"Invalid Pointer to Object: Parameter # %d"
,1); if (((PetscObject)(pc))->classid != PC_CLASSID) { if (
((PetscObject)(pc))->classid == -1) return PetscError(((MPI_Comm
)0x44000001),1225,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,64,PETSC_ERROR_INITIAL,"Object already free: Parameter # %d"
,1); else return PetscError(((MPI_Comm)0x44000001),1225,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",62,PETSC_ERROR_INITIAL
,"Wrong type of object: Parameter # %d",1); } } while (0);

1226

if (!mglevels) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_ORDER,"Must set MG levels with PCMGSetLevels() before calling")return PetscError(PetscObjectComm((PetscObject)pc),1226,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",58,PETSC_ERROR_INITIAL
,"Must set MG levels with PCMGSetLevels() before calling");

1227

levels = mglevels[0]->levels;

1228

1229

for (i=1; i<levels; i++) {

1230

const char *prefix = NULL((void*)0);

1231

/* make sure smoother up and down are different */

1232

ierr = PCMGGetSmootherUp(pc,i,&subksp);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1232,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1233

ierr = KSPGetOptionsPrefix(mglevels[i]->smoothd,&prefix);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1233,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1234

ierr = KSPSetOptionsPrefix(subksp,prefix);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1234,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1235

ierr = KSPAppendOptionsPrefix(subksp,"up_");CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1235,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1236

}

1237

1238

}

1239

1240

/* No new matrices are created, and the coarse operator matrices are the references to the original ones */

1241

PetscErrorCode PCGetInterpolations_MG(PC pc,PetscInt *num_levels,Mat *interpolations[])

1242

{

1243

PC_MG *mg = (PC_MG*)pc->data;

1244

PC_MG_Levels **mglevels = mg->levels;

1245

Mat *mat;

1246

PetscInt l;

1247

PetscErrorCode ierr;

1248

1249

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 1249; petscstack->
petscroutine[petscstack->currentsize] = PETSC_TRUE; petscstack
->currentsize++; } if (petscstack) { petscstack->hotdepth
+= (PETSC_FALSE || petscstack->hotdepth); } ; } while (0)
; ; } while (0);

1250

if (!mglevels) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_WRONGSTATE,"Must set MG levels before calling")return PetscError(PetscObjectComm((PetscObject)pc),1250,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",73,PETSC_ERROR_INITIAL
,"Must set MG levels before calling");

1251

ierr = PetscMalloc1(mg->nlevels,&mat)PetscMallocA(1,PETSC_FALSE,1251,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,(size_t)(mg->nlevels)*sizeof(**(&mat)),(&mat));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1251,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1252

for (l=1; l< mg->nlevels; l++) {

1253

mat[l-1] = mglevels[l]->interpolate;

1254

ierr = PetscObjectReference((PetscObject)mat[l-1]);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1254,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1255

}

1256

*num_levels = mg->nlevels;

1257

*interpolations = mat;

1258

1259

}

1260

1261

/* No new matrices are created, and the coarse operator matrices are the references to the original ones */

1262

PetscErrorCode PCGetCoarseOperators_MG(PC pc,PetscInt *num_levels,Mat *coarseOperators[])

1263

{

1264

PC_MG *mg = (PC_MG*)pc->data;

1265

PC_MG_Levels **mglevels = mg->levels;

1266

PetscInt l;

1267

Mat *mat;

1268

PetscErrorCode ierr;

1269

1270

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 1270; petscstack->
petscroutine[petscstack->currentsize] = PETSC_TRUE; petscstack
->currentsize++; } if (petscstack) { petscstack->hotdepth
+= (PETSC_FALSE || petscstack->hotdepth); } ; } while (0)
; ; } while (0);

1271

if (!mglevels) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_WRONGSTATE,"Must set MG levels before calling")return PetscError(PetscObjectComm((PetscObject)pc),1271,__func__
,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c",73,PETSC_ERROR_INITIAL
,"Must set MG levels before calling");

1272

ierr = PetscMalloc1(mg->nlevels,&mat)PetscMallocA(1,PETSC_FALSE,1272,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,(size_t)(mg->nlevels)*sizeof(**(&mat)),(&mat));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1272,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1273

for (l=0; l<mg->nlevels-1; l++) {

1274

ierr = KSPGetOperators(mglevels[l]->smoothd,NULL((void*)0),&(mat[l]));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1274,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1275

ierr = PetscObjectReference((PetscObject)mat[l]);CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1275,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1276

}

1277

*num_levels = mg->nlevels;

1278

*coarseOperators = mat;

1279

1280

}

1281

1282

/* ----------------------------------------------------------------------------------------*/

1283

1284

/*MC

1285

PCMG - Use multigrid preconditioning. This preconditioner requires you provide additional

1286

information about the coarser grid matrices and restriction/interpolation operators.

1287

1288

Options Database Keys:

1289

+ -pc_mg_levels <nlevels> - number of levels including finest

1290

. -pc_mg_cycle_type <v,w> - provide the cycle desired

1291

. -pc_mg_type <additive,multiplicative,full,kaskade> - multiplicative is the default

1292

. -pc_mg_log - log information about time spent on each level of the solver

1293

. -pc_mg_distinct_smoothup - configure up (after interpolation) and down (before restriction) smoothers separately (with different options prefixes)

1294

. -pc_mg_galerkin <both,pmat,mat,none> - use Galerkin process to compute coarser operators, i.e. Acoarse = R A R'

1295

. -pc_mg_multiplicative_cycles - number of cycles to use as the preconditioner (defaults to 1)

1296

. -pc_mg_dump_matlab - dumps the matrices for each level and the restriction/interpolation matrices

1297

to the Socket viewer for reading from MATLAB.

1298

- -pc_mg_dump_binary - dumps the matrices for each level and the restriction/interpolation matrices

1299

to the binary output file called binaryoutput

1300

1301

Notes:

1302

If one uses a Krylov method such GMRES or CG as the smoother then one must use KSPFGMRES, KSPGCR, or KSPRICHARDSON as the outer Krylov method

1303

1304

When run with a single level the smoother options are used on that level NOT the coarse grid solver options

1305

1306

When run with KSPRICHARDSON the convergence test changes slightly if monitor is turned on. The iteration count may change slightly. This

1307

is because without monitoring the residual norm is computed WITHIN each multigrid cycle on the finest level after the pre-smoothing

1308

(because the residual has just been computed for the multigrid algorithm and is hence available for free) while with monitoring the

1309

residual is computed at the end of each cycle.

1310

1311

Level: intermediate

1312

1313

.seealso: PCCreate(), PCSetType(), PCType (for list of available types), PC, PCMGType, PCEXOTIC, PCGAMG, PCML, PCHYPRE

1314

PCMGSetLevels(), PCMGGetLevels(), PCMGSetType(), PCMGSetCycleType(),

1315

PCMGSetDistinctSmoothUp(), PCMGGetCoarseSolve(), PCMGSetResidual(), PCMGSetInterpolation(),

1316

PCMGSetRestriction(), PCMGGetSmoother(), PCMGGetSmootherUp(), PCMGGetSmootherDown(),

1317

PCMGSetCycleTypeOnLevel(), PCMGSetRhs(), PCMGSetX(), PCMGSetR()

1318

M*/

1319

1320

PETSC_EXTERNextern __attribute__((visibility ("default"))) PetscErrorCode PCCreate_MG(PC pc)

1321

{

1322

PC_MG *mg;

1323

PetscErrorCode ierr;

1324

1325

PetscFunctionBegindo { do { ; if (petscstack && (petscstack->currentsize
< 64)) { petscstack->function[petscstack->currentsize
] = __func__; petscstack->file[petscstack->currentsize]
= "/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"; petscstack
->line[petscstack->currentsize] = 1325; petscstack->
petscroutine[petscstack->currentsize] = PETSC_TRUE; petscstack
->currentsize++; } if (petscstack) { petscstack->hotdepth
+= (PETSC_FALSE || petscstack->hotdepth); } ; } while (0)
; ; } while (0);

1326

ierr = PetscNewLog(pc,&mg)(PetscMallocA(1,PETSC_TRUE,1326,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,(size_t)(1)*sizeof(**(((&mg)))),(((&mg)))) || PetscLogObjectMemory
((PetscObject)pc,sizeof(**(&mg))));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1326,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1327

pc->data = (void*)mg;

1328

mg->nlevels = -1;

1329

mg->am = PC_MG_MULTIPLICATIVE;

1330

mg->galerkin = PC_MG_GALERKIN_NONE;

1331

1332

pc->useAmat = PETSC_TRUE;

1333

1334

pc->ops->apply = PCApply_MG;

1335

pc->ops->setup = PCSetUp_MG;

1336

pc->ops->reset = PCReset_MG;

1337

pc->ops->destroy = PCDestroy_MG;

1338

pc->ops->setfromoptions = PCSetFromOptions_MG;

1339

pc->ops->view = PCView_MG;

1340

1341

ierr = PetscObjectComposeFunction((PetscObject)pc,"PCMGSetGalerkin_C",PCMGSetGalerkin_MG)PetscObjectComposeFunction_Private((PetscObject)pc,"PCMGSetGalerkin_C"
,(PetscVoidFunction)(PCMGSetGalerkin_MG));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1341,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1342

ierr = PetscObjectComposeFunction((PetscObject)pc,"PCMGGetLevels_C",PCMGGetLevels_MG)PetscObjectComposeFunction_Private((PetscObject)pc,"PCMGGetLevels_C"
,(PetscVoidFunction)(PCMGGetLevels_MG));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1342,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1343

ierr = PetscObjectComposeFunction((PetscObject)pc,"PCMGSetLevels_C",PCMGSetLevels_MG)PetscObjectComposeFunction_Private((PetscObject)pc,"PCMGSetLevels_C"
,(PetscVoidFunction)(PCMGSetLevels_MG));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1343,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1344

ierr = PetscObjectComposeFunction((PetscObject)pc,"PCGetInterpolations_C",PCGetInterpolations_MG)PetscObjectComposeFunction_Private((PetscObject)pc,"PCGetInterpolations_C"
,(PetscVoidFunction)(PCGetInterpolations_MG));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1344,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1345

ierr = PetscObjectComposeFunction((PetscObject)pc,"PCGetCoarseOperators_C",PCGetCoarseOperators_MG)PetscObjectComposeFunction_Private((PetscObject)pc,"PCGetCoarseOperators_C"
,(PetscVoidFunction)(PCGetCoarseOperators_MG));CHKERRQ(ierr)do {if (__builtin_expect(!!(ierr),0)) return PetscError(((MPI_Comm
)0x44000001),1345,__func__,"/sandbox/petsc/petsc.next/src/ksp/pc/impls/mg/mg.c"
,ierr,PETSC_ERROR_REPEAT," ");} while (0);

1346

1347

}