KSPOrthogonalizationCGSRefinementType

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

Synopsis

typedef enum {
  KSP_ORTHOGONALIZATION_CGS_REFINE_NEVER    = 0,
  KSP_ORTHOGONALIZATION_CGS_REFINE_IFNEEDED = 1,
  KSP_ORTHOGONALIZATION_CGS_REFINE_ALWAYS   = 2,
  KSP_GMRES_CGS_REFINE_NEVER_DEPRECATED     = 0,
  KSP_GMRES_CGS_REFINE_IFNEEDED_DEPRECATED  = 1,
  KSP_GMRES_CGS_REFINE_ALWAYS_DEPRECATED    = 2
} KSPOrthogonalizationCGSRefinementType;

Values

• KSP_ORTHOGONALIZATION_CGS_REFINE_NEVER - one step of classical Gram-Schmidt

• KSP_ORTHOGONALIZATION_CGS_REFINE_IFNEEDED - a second step is performed if the first step does not satisfy some criteria

• KSP_ORTHOGONALIZATION_CGS_REFINE_ALWAYS - always perform two steps

See Also

KSP: Linear System Solvers, KSP, KSPGMRES, KSPOrthogonalizationClassicalGramSchmidt(), KSPOrthogonalizationSet(), KSPOrthogonalizationGet(), KSPOrthogonalizationSetCGSRefinementType(), KSPOrthogonalizationGetCGSRefinementType(), KSPOrthogonalizationModifiedGramSchmidt()

Level

advanced

Location

include/petscksp.h

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Index of all KSP routines
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