KSPGMRESSetCGSRefinementType#
Sets the type of iterative refinement to use in the classical Gram-Schmidt orthogonalization used by KSPGMRES
and other PETSc GMRES implementations.
Synopsis#
#include "petscksp.h"
PetscErrorCode KSPGMRESSetCGSRefinementType(KSP ksp, KSPGMRESCGSRefinementType type)
Logically Collective
Input Parameters#
ksp - the Krylov space solver context
type - the type of refinement
Options Database Key#
-ksp_gmres_cgs_refinement_type <refine_never,refine_ifneeded,refine_always> - refinement type
Notes#
The default is KSP_GMRES_CGS_REFINE_NEVER
For a very small set of problems not using refinement, that is KSP_GMRES_CGS_REFINE_NEVER
may be unstable, thus causing KSPSolve()
to not converge.
See Also#
KSP: Linear System Solvers, KSPGMRES
, KSPGMRESSetOrthogonalization()
, KSPGMRESCGSRefinementType
, KSPGMRESClassicalGramSchmidtOrthogonalization()
, KSPGMRESGetCGSRefinementType()
,
KSPGMRESGetOrthogonalization()
Level#
intermediate
Location#
Implementations#
KSPGMRESSetCGSRefinementType_GMRES() in src/ksp/ksp/impls/gmres/gmres.c
Index of all KSP routines
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