KSP_GMRES_CGS_REFINE_ALWAYS#
Do two steps of the classical (unmodified) Gram-Schmidt process.
Notes#
This is roughly twice the cost of KSP_GMRES_CGS_REFINE_NEVER because it performs the process twice
but it saves the extra norm calculation needed by KSP_GMRES_CGS_REFINE_IFNEEDED.
You should only use this if you absolutely know that the iterative refinement is needed.
See Also#
KSP: Linear System Solvers, KSPGMRESCGSRefinementType, KSPGMRESClassicalGramSchmidtOrthogonalization(), KSPGMRESSetOrthogonalization(),
KSP, KSPGMRESGetOrthogonalization(),
KSPGMRESSetCGSRefinementType(), KSPGMRESGetCGSRefinementType(), KSP_GMRES_CGS_REFINE_IFNEEDED, 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