petsc-3.14.6 2021-03-30

KSPPIPEFCGSetMmax

set the maximum number of previous directions PIPEFCG will store for orthogonalization

Synopsis

#include "petscksp.h"  
PetscErrorCode KSPPIPEFCGSetMmax(KSP ksp,PetscInt mmax)

Note: mmax + 1 directions are stored (mmax previous ones along with the current one) and whether all are used in each iteration also depends on the truncation strategy (see KSPPIPEFCGSetTruncationType)

Logically Collective on ksp

Input Parameters

	ksp	- the Krylov space context
	mmax	- the maximum number of previous directions to orthogonalize against

Options Database

-ksp_pipefcg_mmax <N>

Level

intermediate

Location