petsc-3.13.6 2020-09-29

KSPPIPEGCRSetTruncationType

specify how many of its stored previous directions PIPEGCR uses during orthoganalization

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

Logically Collective on ksp

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 choice of strategy

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

intermediate