KSPPIPEGCRSetMmax

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

Synopsis

#include "petscksp.h"  
PetscErrorCode KSPPIPEGCRSetMmax(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_pipegcr_mmax - maximum number of previous 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 KSPPIPEGCRSetTruncationType)

See Also

KSP: Linear System Solvers, KSPPIPEGCR, KSPPIPEGCRSetTruncationType(), KSPPIPEGCRSetNprealloc()

Level

intermediate

Location

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

---

Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages