KSP_GMRES_CGS_REFINE_IFNEEDED#
Do the classical (unmodified) Gram-Schmidt process and one step of iterative refinement if an estimate of the orthogonality of the resulting vectors indicates poor orthogonality.
Note#
This is slower than KSP_GMRES_CGS_REFINE_NEVER because it requires an extra norm computation to
estimate the orthogonality but is more stable.
See Also#
KSP: Linear System Solvers, KSPGMRES, KSPGMRESCGSRefinementType, KSPGMRESClassicalGramSchmidtOrthogonalization(), KSPGMRESSetOrthogonalization(),
KSP, KSPGMRESGetOrthogonalization(),
KSPGMRESSetCGSRefinementType(), KSPGMRESGetCGSRefinementType(), KSP_GMRES_CGS_REFINE_NEVER, KSP_GMRES_CGS_REFINE_ALWAYS,
KSPGMRESModifiedGramSchmidtOrthogonalization()
Level#
advanced
Location#
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages