KSPGMRESCGSRefinementType#

How the classical (unmodified) Gram-Schmidt is performed in the GMRES solvers

Synopsis#

typedef enum {
  KSP_GMRES_CGS_REFINE_NEVER,
  KSP_GMRES_CGS_REFINE_IFNEEDED,
  KSP_GMRES_CGS_REFINE_ALWAYS
} KSPGMRESCGSRefinementType;

Values#

KSP_GMRES_CGS_REFINE_NEVER - one step of classical Gram-Schmidt
KSP_GMRES_CGS_REFINE_IFNEEDED - a second step is performed if the first step does not satisfy some criteria
KSP_GMRES_CGS_REFINE_ALWAYS - always perform two steps

See Also#

KSP: Linear System Solvers, KSP, KSPGMRESClassicalGramSchmidtOrthogonalization(), KSPGMRESSetOrthogonalization(), KSPGMRESGetOrthogonalization(), KSPGMRESSetCGSRefinementType(), KSPGMRESGetCGSRefinementType(), KSPGMRESModifiedGramSchmidtOrthogonalization()

Level#

advanced

Location#

include/petscksp.h

Index of all KSP routines
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Index of all manual pages