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
Input Parameters#
- ksp - the iterative context 
- scale - - PETSC_TRUEor the default of- PETSC_FALSE
Options Database Key#
- -ksp_richardson_self_scale - Use self-scaling 
Note#
Requires two extra work vectors. Uses an extra VecAXPY() and VecDotNorm2() per iteration.
Developer Note#
Could also minimize the 2-norm of the true residual with one less work vector
See Also#
KSP: Linear System Solvers, 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