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 - maximum number of previous directions

See Also#

KSPPIPEFCG, KSPPIPEFCGSetTruncationType(), KSPPIPEFCGSetNprealloc()

Level#

intermediate

Location#

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


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