Actual source code: kspimpl.h
2: #ifndef _KSPIMPL_H
3: #define _KSPIMPL_H
5: #include <petscksp.h>
6: #include <petscds.h>
7: #include <petsc/private/petscimpl.h>
9: /* SUBMANSEC = KSP */
11: PETSC_EXTERN PetscBool KSPRegisterAllCalled;
12: PETSC_EXTERN PetscBool KSPMonitorRegisterAllCalled;
13: PETSC_EXTERN PetscErrorCode KSPRegisterAll(void);
14: PETSC_EXTERN PetscErrorCode KSPMonitorRegisterAll(void);
15: PETSC_EXTERN PetscErrorCode KSPGuessRegisterAll(void);
16: PETSC_EXTERN PetscErrorCode KSPMatRegisterAll(void);
18: typedef struct _KSPOps *KSPOps;
20: struct _KSPOps {
21: PetscErrorCode (*buildsolution)(KSP, Vec, Vec *); /* Returns a pointer to the solution, or
22: calculates the solution in a
23: user-provided area. */
24: PetscErrorCode (*buildresidual)(KSP, Vec, Vec, Vec *); /* Returns a pointer to the residual, or
25: calculates the residual in a
26: user-provided area. */
27: PetscErrorCode (*solve)(KSP); /* actual solver */
28: PetscErrorCode (*matsolve)(KSP, Mat, Mat); /* multiple dense RHS solver */
29: PetscErrorCode (*setup)(KSP);
30: PetscErrorCode (*setfromoptions)(KSP, PetscOptionItems *);
31: PetscErrorCode (*publishoptions)(KSP);
32: PetscErrorCode (*computeextremesingularvalues)(KSP, PetscReal *, PetscReal *);
33: PetscErrorCode (*computeeigenvalues)(KSP, PetscInt, PetscReal *, PetscReal *, PetscInt *);
34: PetscErrorCode (*computeritz)(KSP, PetscBool, PetscBool, PetscInt *, Vec[], PetscReal *, PetscReal *);
35: PetscErrorCode (*destroy)(KSP);
36: PetscErrorCode (*view)(KSP, PetscViewer);
37: PetscErrorCode (*reset)(KSP);
38: PetscErrorCode (*load)(KSP, PetscViewer);
39: };
41: typedef struct _KSPGuessOps *KSPGuessOps;
43: struct _KSPGuessOps {
44: PetscErrorCode (*formguess)(KSPGuess, Vec, Vec); /* Form initial guess */
45: PetscErrorCode (*update)(KSPGuess, Vec, Vec); /* Update database */
46: PetscErrorCode (*setfromoptions)(KSPGuess);
47: PetscErrorCode (*settolerance)(KSPGuess, PetscReal);
48: PetscErrorCode (*setup)(KSPGuess);
49: PetscErrorCode (*destroy)(KSPGuess);
50: PetscErrorCode (*view)(KSPGuess, PetscViewer);
51: PetscErrorCode (*reset)(KSPGuess);
52: };
54: /*
55: Defines the KSPGuess data structure.
56: */
57: struct _p_KSPGuess {
58: PETSCHEADER(struct _KSPGuessOps);
59: KSP ksp; /* the parent KSP */
60: Mat A; /* the current linear operator */
61: PetscObjectState omatstate; /* previous linear operator state */
62: void *data; /* pointer to the specific implementation */
63: };
65: PETSC_EXTERN PetscErrorCode KSPGuessCreate_Fischer(KSPGuess);
66: PETSC_EXTERN PetscErrorCode KSPGuessCreate_POD(KSPGuess);
68: /*
69: Maximum number of monitors you can run with a single KSP
70: */
71: #define MAXKSPMONITORS 5
72: #define MAXKSPREASONVIEWS 5
73: typedef enum {
74: KSP_SETUP_NEW,
75: KSP_SETUP_NEWMATRIX,
76: KSP_SETUP_NEWRHS
77: } KSPSetUpStage;
79: /*
80: Defines the KSP data structure.
81: */
82: struct _p_KSP {
83: PETSCHEADER(struct _KSPOps);
84: DM dm;
85: PetscBool dmAuto; /* DM was created automatically by KSP */
86: PetscBool dmActive; /* KSP should use DM for computing operators */
87: /*------------------------- User parameters--------------------------*/
88: PetscInt max_it; /* maximum number of iterations */
89: KSPGuess guess;
90: PetscBool guess_zero, /* flag for whether initial guess is 0 */
91: calc_sings, /* calculate extreme Singular Values */
92: calc_ritz, /* calculate (harmonic) Ritz pairs */
93: guess_knoll; /* use initial guess of PCApply(ksp->B,b */
94: PCSide pc_side; /* flag for left, right, or symmetric preconditioning */
95: PetscInt normsupporttable[KSP_NORM_MAX][PC_SIDE_MAX]; /* Table of supported norms and pc_side, see KSPSetSupportedNorm() */
96: PetscReal rtol, /* relative tolerance */
97: abstol, /* absolute tolerance */
98: ttol, /* (not set by user) */
99: divtol; /* divergence tolerance */
100: PetscReal rnorm0; /* initial residual norm (used for divergence testing) */
101: PetscReal rnorm; /* current residual norm */
102: KSPConvergedReason reason;
103: PetscBool errorifnotconverged; /* create an error if the KSPSolve() does not converge */
105: Vec vec_sol, vec_rhs; /* pointer to where user has stashed
106: the solution and rhs, these are
107: never touched by the code, only
108: passed back to the user */
109: PetscReal *res_hist; /* If !0 stores residual each at iteration */
110: PetscReal *res_hist_alloc; /* If !0 means user did not provide buffer, needs deallocation */
111: size_t res_hist_len; /* current size of residual history array */
112: size_t res_hist_max; /* actual amount of storage in residual history */
113: PetscBool res_hist_reset; /* reset history to length zero for each new solve */
114: PetscReal *err_hist; /* If !0 stores error at each iteration */
115: PetscReal *err_hist_alloc; /* If !0 means user did not provide buffer, needs deallocation */
116: size_t err_hist_len; /* current size of error history array */
117: size_t err_hist_max; /* actual amount of storage in error history */
118: PetscBool err_hist_reset; /* reset history to length zero for each new solve */
120: PetscInt chknorm; /* only compute/check norm if iterations is great than this */
121: PetscBool lagnorm; /* Lag the residual norm calculation so that it is computed as part of the
122: MPI_Allreduce() for computing the inner products for the next iteration. */
124: PetscInt nmax; /* maximum number of right-hand sides to be handled simultaneously */
126: /* --------User (or default) routines (most return -1 on error) --------*/
127: PetscErrorCode (*monitor[MAXKSPMONITORS])(KSP, PetscInt, PetscReal, void *); /* returns control to user after */
128: PetscErrorCode (*monitordestroy[MAXKSPMONITORS])(void **); /* */
129: void *monitorcontext[MAXKSPMONITORS]; /* residual calculation, allows user */
130: PetscInt numbermonitors; /* to, for instance, print residual norm, etc. */
131: PetscBool pauseFinal; /* Pause all drawing monitor at the final iterate */
133: PetscErrorCode (*reasonview[MAXKSPREASONVIEWS])(KSP, void *); /* KSP converged reason view */
134: PetscErrorCode (*reasonviewdestroy[MAXKSPREASONVIEWS])(void **); /* Optional destroy routine */
135: void *reasonviewcontext[MAXKSPREASONVIEWS]; /* User context */
136: PetscInt numberreasonviews; /* Number if reason viewers */
138: PetscErrorCode (*converged)(KSP, PetscInt, PetscReal, KSPConvergedReason *, void *);
139: PetscErrorCode (*convergeddestroy)(void *);
140: void *cnvP;
142: void *user; /* optional user-defined context */
144: PC pc;
146: void *data; /* holder for misc stuff associated
147: with a particular iterative solver */
149: PetscBool view, viewPre, viewRate, viewMat, viewPMat, viewRhs, viewSol, viewMatExp, viewEV, viewSV, viewEVExp, viewFinalRes, viewPOpExp, viewDScale;
150: PetscViewer viewer, viewerPre, viewerRate, viewerMat, viewerPMat, viewerRhs, viewerSol, viewerMatExp, viewerEV, viewerSV, viewerEVExp, viewerFinalRes, viewerPOpExp, viewerDScale;
151: PetscViewerFormat format, formatPre, formatRate, formatMat, formatPMat, formatRhs, formatSol, formatMatExp, formatEV, formatSV, formatEVExp, formatFinalRes, formatPOpExp, formatDScale;
153: /* ----------------Default work-area management -------------------- */
154: PetscInt nwork;
155: Vec *work;
157: KSPSetUpStage setupstage;
158: PetscBool setupnewmatrix; /* true if we need to call ksp->ops->setup with KSP_SETUP_NEWMATRIX */
160: PetscInt its; /* number of iterations so far computed in THIS linear solve*/
161: PetscInt totalits; /* number of iterations used by this KSP object since it was created */
163: PetscBool transpose_solve; /* solve transpose system instead */
164: struct {
165: Mat AT, BT;
166: PetscBool use_explicittranspose; /* transpose the system explicitly in KSPSolveTranspose */
167: PetscBool reuse_transpose; /* reuse the previous transposed system */
168: } transpose;
170: KSPNormType normtype; /* type of norm used for convergence tests */
172: PCSide pc_side_set; /* PC type set explicitly by user */
173: KSPNormType normtype_set; /* Norm type set explicitly by user */
175: /* Allow diagonally scaling the matrix before computing the preconditioner or using
176: the Krylov method. Note this is NOT just Jacobi preconditioning */
178: PetscBool dscale; /* diagonal scale system; used with KSPSetDiagonalScale() */
179: PetscBool dscalefix; /* unscale system after solve */
180: PetscBool dscalefix2; /* system has been unscaled */
181: Vec diagonal; /* 1/sqrt(diag of matrix) */
182: Vec truediagonal;
184: PetscInt setfromoptionscalled;
185: PetscBool skippcsetfromoptions; /* if set then KSPSetFromOptions() does not call PCSetFromOptions() */
187: PetscErrorCode (*presolve)(KSP, Vec, Vec, void *);
188: PetscErrorCode (*postsolve)(KSP, Vec, Vec, void *);
189: void *prectx, *postctx;
190: };
192: typedef struct { /* dummy data structure used in KSPMonitorDynamicTolerance() */
193: PetscReal coef;
194: PetscReal bnrm;
195: } KSPDynTolCtx;
197: typedef struct {
198: PetscBool initialrtol; /* default relative residual decrease is computed from initial residual, not rhs */
199: PetscBool mininitialrtol; /* default relative residual decrease is computed from min of initial residual and rhs */
200: PetscBool convmaxits; /* if true, the convergence test returns KSP_CONVERGED_ITS if the maximum number of iterations is reached */
201: Vec work;
202: } KSPConvergedDefaultCtx;
204: static inline PetscErrorCode KSPLogResidualHistory(KSP ksp, PetscReal norm)
205: {
206: PetscFunctionBegin;
207: PetscCall(PetscObjectSAWsTakeAccess((PetscObject)ksp));
208: if (ksp->res_hist && ksp->res_hist_max > ksp->res_hist_len) ksp->res_hist[ksp->res_hist_len++] = norm;
209: PetscCall(PetscObjectSAWsGrantAccess((PetscObject)ksp));
210: PetscFunctionReturn(PETSC_SUCCESS);
211: }
213: static inline PetscErrorCode KSPLogErrorHistory(KSP ksp)
214: {
215: DM dm;
217: PetscFunctionBegin;
218: PetscCall(PetscObjectSAWsTakeAccess((PetscObject)ksp));
219: PetscCall(KSPGetDM(ksp, &dm));
220: if (dm && ksp->err_hist && ksp->err_hist_max > ksp->err_hist_len) {
221: PetscSimplePointFunc exactSol;
222: void *exactCtx;
223: PetscDS ds;
224: Vec u;
225: PetscReal error;
226: PetscInt Nf;
228: PetscCall(KSPBuildSolution(ksp, NULL, &u));
229: /* TODO Was needed to correct for Newton solution, but I just need to set a solution */
230: //PetscCall(VecScale(u, -1.0));
231: /* TODO Case when I have a solution */
232: if (0) {
233: PetscCall(DMGetDS(dm, &ds));
234: PetscCall(PetscDSGetNumFields(ds, &Nf));
235: PetscCheck(Nf <= 1, PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "Cannot handle number of fields %" PetscInt_FMT " > 1 right now", Nf);
236: PetscCall(PetscDSGetExactSolution(ds, 0, &exactSol, &exactCtx));
237: PetscCall(DMComputeL2FieldDiff(dm, 0.0, &exactSol, &exactCtx, u, &error));
238: } else {
239: /* The null solution A 0 = 0 */
240: PetscCall(VecNorm(u, NORM_2, &error));
241: }
242: ksp->err_hist[ksp->err_hist_len++] = error;
243: }
244: PetscCall(PetscObjectSAWsGrantAccess((PetscObject)ksp));
245: PetscFunctionReturn(PETSC_SUCCESS);
246: }
248: static inline PetscScalar KSPNoisyHash_Private(PetscInt xx)
249: {
250: unsigned int x = (unsigned int)xx;
251: x = ((x >> 16) ^ x) * 0x45d9f3b;
252: x = ((x >> 16) ^ x) * 0x45d9f3b;
253: x = ((x >> 16) ^ x);
254: return (PetscScalar)((PetscInt64)x - 2147483648) * 5.e-10; /* center around zero, scaled about -1. to 1.*/
255: }
257: static inline PetscErrorCode KSPSetNoisy_Private(Vec v)
258: {
259: PetscScalar *a;
260: PetscInt n, istart;
262: PetscFunctionBegin;
263: PetscCall(VecGetOwnershipRange(v, &istart, NULL));
264: PetscCall(VecGetLocalSize(v, &n));
265: PetscCall(VecGetArrayWrite(v, &a));
266: for (PetscInt i = 0; i < n; ++i) a[i] = KSPNoisyHash_Private(i + istart);
267: PetscCall(VecRestoreArrayWrite(v, &a));
268: PetscFunctionReturn(PETSC_SUCCESS);
269: }
271: PETSC_INTERN PetscErrorCode KSPSetUpNorms_Private(KSP, PetscBool, KSPNormType *, PCSide *);
273: PETSC_INTERN PetscErrorCode KSPPlotEigenContours_Private(KSP, PetscInt, const PetscReal *, const PetscReal *);
275: typedef struct _p_DMKSP *DMKSP;
276: typedef struct _DMKSPOps *DMKSPOps;
277: struct _DMKSPOps {
278: PetscErrorCode (*computeoperators)(KSP, Mat, Mat, void *);
279: PetscErrorCode (*computerhs)(KSP, Vec, void *);
280: PetscErrorCode (*computeinitialguess)(KSP, Vec, void *);
281: PetscErrorCode (*destroy)(DMKSP *);
282: PetscErrorCode (*duplicate)(DMKSP, DMKSP);
283: };
285: struct _p_DMKSP {
286: PETSCHEADER(struct _DMKSPOps);
287: void *operatorsctx;
288: void *rhsctx;
289: void *initialguessctx;
290: void *data;
292: /* This is NOT reference counted. The DM on which this context was first created is cached here to implement one-way
293: * copy-on-write. When DMGetDMKSPWrite() sees a request using a different DM, it makes a copy. Thus, if a user
294: * only interacts directly with one level, e.g., using KSPSetComputeOperators(), then coarse levels are constructed by
295: * PCMG, then the user changes the routine with another call to KSPSetComputeOperators(), it automatically propagates
296: * to all the levels. If instead, they get out a specific level and set the routines on that level, subsequent changes
297: * to the original level will no longer propagate to that level.
298: */
299: DM originaldm;
301: void (*fortran_func_pointers[3])(void); /* Store our own function pointers so they are associated with the DMKSP instead of the DM */
302: };
303: PETSC_EXTERN PetscErrorCode DMGetDMKSP(DM, DMKSP *);
304: PETSC_EXTERN PetscErrorCode DMGetDMKSPWrite(DM, DMKSP *);
305: PETSC_EXTERN PetscErrorCode DMCopyDMKSP(DM, DM);
307: /*
308: These allow the various Krylov methods to apply to either the linear system or its transpose.
309: */
310: static inline PetscErrorCode KSP_RemoveNullSpace(KSP ksp, Vec y)
311: {
312: PetscFunctionBegin;
313: if (ksp->pc_side == PC_LEFT) {
314: Mat A;
315: MatNullSpace nullsp;
317: PetscCall(PCGetOperators(ksp->pc, &A, NULL));
318: PetscCall(MatGetNullSpace(A, &nullsp));
319: if (nullsp) PetscCall(MatNullSpaceRemove(nullsp, y));
320: }
321: PetscFunctionReturn(PETSC_SUCCESS);
322: }
324: static inline PetscErrorCode KSP_RemoveNullSpaceTranspose(KSP ksp, Vec y)
325: {
326: PetscFunctionBegin;
327: if (ksp->pc_side == PC_LEFT) {
328: Mat A;
329: MatNullSpace nullsp;
331: PetscCall(PCGetOperators(ksp->pc, &A, NULL));
332: PetscCall(MatGetTransposeNullSpace(A, &nullsp));
333: if (nullsp) PetscCall(MatNullSpaceRemove(nullsp, y));
334: }
335: PetscFunctionReturn(PETSC_SUCCESS);
336: }
338: static inline PetscErrorCode KSP_MatMult(KSP ksp, Mat A, Vec x, Vec y)
339: {
340: PetscFunctionBegin;
341: if (ksp->transpose_solve) PetscCall(MatMultTranspose(A, x, y));
342: else PetscCall(MatMult(A, x, y));
343: PetscFunctionReturn(PETSC_SUCCESS);
344: }
346: static inline PetscErrorCode KSP_MatMultTranspose(KSP ksp, Mat A, Vec x, Vec y)
347: {
348: PetscFunctionBegin;
349: if (ksp->transpose_solve) PetscCall(MatMult(A, x, y));
350: else PetscCall(MatMultTranspose(A, x, y));
351: PetscFunctionReturn(PETSC_SUCCESS);
352: }
354: static inline PetscErrorCode KSP_MatMultHermitianTranspose(KSP ksp, Mat A, Vec x, Vec y)
355: {
356: PetscFunctionBegin;
357: if (!ksp->transpose_solve) PetscCall(MatMultHermitianTranspose(A, x, y));
358: else {
359: Vec w;
361: PetscCall(VecDuplicate(x, &w));
362: PetscCall(VecCopy(x, w));
363: PetscCall(VecConjugate(w));
364: PetscCall(MatMult(A, w, y));
365: PetscCall(VecDestroy(&w));
366: PetscCall(VecConjugate(y));
367: }
368: PetscFunctionReturn(PETSC_SUCCESS);
369: }
371: static inline PetscErrorCode KSP_PCApply(KSP ksp, Vec x, Vec y)
372: {
373: PetscFunctionBegin;
374: if (ksp->transpose_solve) {
375: PetscCall(PCApplyTranspose(ksp->pc, x, y));
376: PetscCall(KSP_RemoveNullSpaceTranspose(ksp, y));
377: } else {
378: PetscCall(PCApply(ksp->pc, x, y));
379: PetscCall(KSP_RemoveNullSpace(ksp, y));
380: }
381: PetscFunctionReturn(PETSC_SUCCESS);
382: }
384: static inline PetscErrorCode KSP_PCApplyTranspose(KSP ksp, Vec x, Vec y)
385: {
386: PetscFunctionBegin;
387: if (ksp->transpose_solve) {
388: PetscCall(PCApply(ksp->pc, x, y));
389: PetscCall(KSP_RemoveNullSpace(ksp, y));
390: } else {
391: PetscCall(PCApplyTranspose(ksp->pc, x, y));
392: PetscCall(KSP_RemoveNullSpaceTranspose(ksp, y));
393: }
394: PetscFunctionReturn(PETSC_SUCCESS);
395: }
397: static inline PetscErrorCode KSP_PCApplyHermitianTranspose(KSP ksp, Vec x, Vec y)
398: {
399: PetscFunctionBegin;
400: PetscCall(VecConjugate(x));
401: PetscCall(KSP_PCApplyTranspose(ksp, x, y));
402: PetscCall(VecConjugate(x));
403: PetscCall(VecConjugate(y));
404: PetscFunctionReturn(PETSC_SUCCESS);
405: }
407: static inline PetscErrorCode KSP_PCApplyBAorAB(KSP ksp, Vec x, Vec y, Vec w)
408: {
409: PetscFunctionBegin;
410: if (ksp->transpose_solve) {
411: PetscCall(PCApplyBAorABTranspose(ksp->pc, ksp->pc_side, x, y, w));
412: PetscCall(KSP_RemoveNullSpaceTranspose(ksp, y));
413: } else {
414: PetscCall(PCApplyBAorAB(ksp->pc, ksp->pc_side, x, y, w));
415: PetscCall(KSP_RemoveNullSpace(ksp, y));
416: }
417: PetscFunctionReturn(PETSC_SUCCESS);
418: }
420: static inline PetscErrorCode KSP_PCApplyBAorABTranspose(KSP ksp, Vec x, Vec y, Vec w)
421: {
422: PetscFunctionBegin;
423: if (ksp->transpose_solve) PetscCall(PCApplyBAorAB(ksp->pc, ksp->pc_side, x, y, w));
424: else PetscCall(PCApplyBAorABTranspose(ksp->pc, ksp->pc_side, x, y, w));
425: PetscFunctionReturn(PETSC_SUCCESS);
426: }
428: PETSC_EXTERN PetscLogEvent KSP_GMRESOrthogonalization;
429: PETSC_EXTERN PetscLogEvent KSP_SetUp;
430: PETSC_EXTERN PetscLogEvent KSP_Solve;
431: PETSC_EXTERN PetscLogEvent KSP_Solve_FS_0;
432: PETSC_EXTERN PetscLogEvent KSP_Solve_FS_1;
433: PETSC_EXTERN PetscLogEvent KSP_Solve_FS_2;
434: PETSC_EXTERN PetscLogEvent KSP_Solve_FS_3;
435: PETSC_EXTERN PetscLogEvent KSP_Solve_FS_4;
436: PETSC_EXTERN PetscLogEvent KSP_Solve_FS_S;
437: PETSC_EXTERN PetscLogEvent KSP_Solve_FS_L;
438: PETSC_EXTERN PetscLogEvent KSP_Solve_FS_U;
439: PETSC_EXTERN PetscLogEvent KSP_SolveTranspose;
440: PETSC_EXTERN PetscLogEvent KSP_MatSolve;
442: PETSC_INTERN PetscErrorCode MatGetSchurComplement_Basic(Mat, IS, IS, IS, IS, MatReuse, Mat *, MatSchurComplementAinvType, MatReuse, Mat *);
443: PETSC_INTERN PetscErrorCode PCPreSolveChangeRHS(PC, PetscBool *);
445: /*MC
446: KSPCheckDot - Checks if the result of a dot product used by the corresponding `KSP` contains Inf or NaN. These indicate that the previous
447: application of the preconditioner generated an error. Sets a `KSPConvergedReason` and returns if the `PC` set a `PCFailedReason`.
449: Collective
451: Input Parameter:
452: . ksp - the linear solver `KSP` context.
454: Output Parameter:
455: . beta - the result of the inner product
457: Level: developer
459: Developer Notes:
460: Used to manage returning from `KSP` solvers whose preconditioners have failed, possibly only a subset of MPI ranks, in some way
462: It uses the fact that `KSP` piggy-backs the collectivity of certain error conditions on the results of norms and inner products.
464: .seealso: `PCFailedReason`, `KSPConvergedReason`, `PCGetFailedReasonRank()`, `KSP`, `KSPCreate()`, `KSPSetType()`, `KSP`, `KSPCheckNorm()`, `KSPCheckSolve()`
465: M*/
466: #define KSPCheckDot(ksp, beta) \
467: do { \
468: if (PetscIsInfOrNanScalar(beta)) { \
469: PetscCheck(!ksp->errorifnotconverged, PetscObjectComm((PetscObject)ksp), PETSC_ERR_NOT_CONVERGED, "KSPSolve has not converged due to Nan or Inf inner product"); \
470: { \
471: PCFailedReason pcreason; \
472: PetscInt sendbuf, recvbuf; \
473: PetscCall(PCGetFailedReasonRank(ksp->pc, &pcreason)); \
474: sendbuf = (PetscInt)pcreason; \
475: PetscCallMPI(MPI_Allreduce(&sendbuf, &recvbuf, 1, MPIU_INT, MPI_MAX, PetscObjectComm((PetscObject)ksp))); \
476: if (recvbuf) { \
477: PetscCall(PCSetFailedReason(ksp->pc, (PCFailedReason)recvbuf)); \
478: ksp->reason = KSP_DIVERGED_PC_FAILED; \
479: PetscCall(VecSetInf(ksp->vec_sol)); \
480: } else { \
481: ksp->reason = KSP_DIVERGED_NANORINF; \
482: } \
483: PetscFunctionReturn(PETSC_SUCCESS); \
484: } \
485: } \
486: } while (0)
488: /*MC
489: KSPCheckNorm - Checks if the result of a norm used by the corresponding `KSP` contains `inf` or `NaN`. These indicate that the previous
490: application of the preconditioner generated an error. Sets a `KSPConvergedReason` and returns if the `PC` set a `PCFailedReason`.
492: Collective
494: Input Parameter:
495: . ksp - the linear solver `KSP` context.
497: Output Parameter:
498: . beta - the result of the norm
500: Level: developer
502: Developer Notes:
503: Used to manage returning from `KSP` solvers whose preconditioners have failed, possibly only a subset of MPI ranks, in some way.
505: It uses the fact that `KSP` piggy-backs the collectivity of certain error conditions on the results of norms and inner products.
507: .seealso: `PCFailedReason`, `KSPConvergedReason`, `PCGetFailedReasonRank()`, `KSP`, `KSPCreate()`, `KSPSetType()`, `KSP`, `KSPCheckDot()`, `KSPCheckSolve()`
508: M*/
509: #define KSPCheckNorm(ksp, beta) \
510: do { \
511: if (PetscIsInfOrNanReal(beta)) { \
512: PetscCheck(!ksp->errorifnotconverged, PetscObjectComm((PetscObject)ksp), PETSC_ERR_NOT_CONVERGED, "KSPSolve has not converged due to Nan or Inf norm"); \
513: { \
514: PCFailedReason pcreason; \
515: PetscInt sendbuf, recvbuf; \
516: PetscCall(PCGetFailedReasonRank(ksp->pc, &pcreason)); \
517: sendbuf = (PetscInt)pcreason; \
518: PetscCallMPI(MPI_Allreduce(&sendbuf, &recvbuf, 1, MPIU_INT, MPI_MAX, PetscObjectComm((PetscObject)ksp))); \
519: if (recvbuf) { \
520: PetscCall(PCSetFailedReason(ksp->pc, (PCFailedReason)recvbuf)); \
521: ksp->reason = KSP_DIVERGED_PC_FAILED; \
522: PetscCall(VecSetInf(ksp->vec_sol)); \
523: ksp->rnorm = beta; \
524: } else { \
525: PetscCall(PCSetFailedReason(ksp->pc, PC_NOERROR)); \
526: ksp->reason = KSP_DIVERGED_NANORINF; \
527: ksp->rnorm = beta; \
528: } \
529: PetscFunctionReturn(PETSC_SUCCESS); \
530: } \
531: } \
532: } while (0)
534: #endif
536: PETSC_INTERN PetscErrorCode KSPMonitorMakeKey_Internal(const char[], PetscViewerType, PetscViewerFormat, char[]);
537: PETSC_INTERN PetscErrorCode KSPMonitorRange_Private(KSP, PetscInt, PetscReal *);