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

See Also#

KSPPIPEGCR, KSPPIPEGCRSetTruncationType, KSPPIPEGCRTruncationType, KSPFCDTruncationType

Level#

intermediate

Location#

src/ksp/ksp/impls/gcr/pipegcr/pipegcr.c


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