KSPPIPEFCGSetMmax

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

Synopsis

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

Logically Collective

Input Parameters

• ksp - the Krylov space context

• mmax - the maximum number of previous directions to orthogonalize against

Options Database Key

• -ksp_pipefcg_mmax - maximum number of previous directions

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()

See Also

KSP: Linear System Solvers, KSPPIPEFCG, KSPPIPEFCGSetTruncationType(), KSPPIPEFCGSetNprealloc(), KSPFCGSetMmax(), KSPFCGGetMmax()

Level

intermediate

Location

src/ksp/ksp/impls/fcg/pipefcg/pipefcg.c

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