petsc-3.12.5 2020-03-29

KSPFCGSetMmax

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

Synopsis

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

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

Logically Collective on ksp

Input Parameters

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

Options Database

-ksp_fcg_mmax <N> -

Level

intermediate

Location