petsc-3.7.5 2017-01-01

KSPPIPEGCRGetTruncationType

get the truncation strategy employed by PIPEGCR

Synopsis

#include "petscksp.h"  
PetscErrorCode KSPPIPEGCRGetTruncationType(KSP ksp,KSPFCDTruncationType *truncstrat)

Not Collective

KSP_FCD_TRUNC_TYPE_STANDARD uses all (up to mmax) stored directions KSP_FCD_TRUNC_TYPE_NOTAY uses the last max(1,mod(i,mmax)) directions at iteration i=0,1,..

Input Parameter

ksp -the Krylov space context

Output Parameter

truncstrat -the strategy type

Options Database

-ksp_pipegcr_truncation, -ksp_pipegcr_truncation_restart

Keywords