petsc-3.10.2 2018-10-09
Report Typos and Errors

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

Keywords

KSP, Richardson, set, scale

Level

intermediate

Location

src/ksp/ksp/impls/rich/richscale.c

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