KSPFCGSetMmax#

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

Synopsis#

#include "petscksp.h"  
PetscErrorCode KSPFCGSetMmax(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_fcg_mmax - maximum number of search directions

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())

See Also#

KSP: Linear System Solvers, KSPFCG, KSPFCGGetTruncationType(), KSPFCGGetNprealloc(), KSPFCGetMmax()

Level#

intermediate

Location#

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


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