KSPGMRESGetOrthogonalization#
Gets the orthogonalization routine used by KSPGMRES and KSPFGMRES.
Synopsis#
#include "petscksp.h"
PetscErrorCode KSPGMRESGetOrthogonalization(KSP ksp, PetscErrorCode (**fcn)(KSP, PetscInt))
Not Collective
Input Parameter#
ksp - iterative context obtained from
KSPCreate()
Output Parameter#
fcn - orthogonalization function
Calling Sequence of fcn#
PetscErrorCode fcn(KSP ksp, PetscInt it);
KSP - the solver context
it - the current iteration
Options Database Keys#
-ksp_gmres_classicalgramschmidt - Activates KSPGMRESClassicalGramSchmidtOrthogonalization() (default)
-ksp_gmres_modifiedgramschmidt - Activates KSPGMRESModifiedGramSchmidtOrthogonalization()
Notes#
Two orthogonalization routines are predefined, including KSPGMRESModifiedGramSchmidtOrthogonalization(), and the default
KSPGMRESClassicalGramSchmidtOrthogonalization()
Use KSPGMRESSetCGSRefinementType() to determine if iterative refinement is used to increase stability.
See Also#
KSP: Linear System Solvers, KSPGMRESSetRestart(), KSPGMRESSetPreAllocateVectors(), KSPGMRESSetCGSRefinementType(), KSPGMRESSetOrthogonalization(),
KSPGMRESModifiedGramSchmidtOrthogonalization(), KSPGMRESClassicalGramSchmidtOrthogonalization(), KSPGMRESGetCGSRefinementType()
Level#
intermediate
Location#
Implementations#
KSPGMRESGetOrthogonalization_GMRES in src/ksp/ksp/impls/gmres/gmres.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages