KSPRichardsonSetSelfScale#
Sets Richardson to automatically determine optimal scaling at each iteration to minimize the 2-norm of the preconditioned residual
Synopsis#
#include "petscksp.h"
PetscErrorCode KSPRichardsonSetSelfScale(KSP ksp, PetscBool scale)
Logically Collective on ksp
Input Parameters#
ksp - the iterative context
scale - PETSC_TRUE or the default of PETSC_FALSE
Options Database Keys#
-ksp_richardson_self_scale - Use self-scaling
Notes#
Requires two extra work vectors. Uses an extra VecAXPY() and VecDotNorm2() per iteration.
Developer Notes#
Could also minimize the 2-norm of the true residual with one less work vector
.seealso: KSPRICHARDSON
, KSPRichardsonSetScale()
Level#
intermediate
Location#
Implementations#
KSPRichardsonSetSelfScale_Richardson in src/ksp/ksp/impls/rich/rich.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages