KSPPIPEGCRSetMmax#

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

Synopsis#

#include "petscksp.h"  
PetscErrorCode KSPPIPEGCRSetMmax(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 KSPPIPEGCRSetTruncationType)

Logically Collective on ksp

Input Parameters#

  • ksp - the Krylov space context

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

Options Database#

  • -ksp_pipegcr_mmax - maximum number of previous directions

See Also#

KSPPIPEGCR, KSPPIPEGCRSetTruncationType(), KSPPIPEGCRSetNprealloc()

Level#

intermediate

Location#

src/ksp/ksp/impls/gcr/pipegcr/pipegcr.c


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