petsc-3.13.6 2020-09-29

KSPPIPEGCRGetTruncationType

get the truncation strategy employed by PIPEGCR

#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,..

ksp -the Krylov space context

truncstrat -the strategy type

-ksp_pipegcr_truncation_type <standard,notay> -which stored basis vectors to orthogonalize against

intermediate