KSPPIPEGCRSetTruncationType

specify how many of its stored previous directions KSPPIPEGCR uses during orthogonalization

Synopsis

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

Logically Collective

Input Parameters

• ksp - the Krylov space context

• truncstrat - the choice of strategy

  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,..

Options Database Key

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

See Also

KSP: Linear System Solvers, KSPPIPEGCR, KSPPIPEGCRTruncationType, KSPFCDTruncationType, KSP_FCD_TRUNC_TYPE_STANDARD, KSP_FCD_TRUNC_TYPE_NOTAY

Level

intermediate

Location

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

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