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, KSPGMRES, KSPGMRESClassicalGramSchmidtOrthogonalization(), KSPGMRESSetOrthogonalization(), KSPGMRESGetOrthogonalization(), KSPGMRESSetCGSRefinementType(), KSPGMRESGetCGSRefinementType(), KSPGMRESModifiedGramSchmidtOrthogonalization()

Level

advanced

Location

include/petscksp.h

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