petsc-3.11.4 2019-09-28
KSP_GMRES_CGS_REFINE_NEVER
Do two steps of the classical (unmodified) Gram-Schmidt process.
Note: 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
KSPGMRESClassicalGramSchmidtOrthogonalization(), KSPGMRESSetOrthogonalization(), KSPGMRESGetOrthogonalization(),
KSPGMRESSetCGSRefinementType(), KSPGMRESGetCGSRefinementType(), KSP_GMRES_CGS_REFINE_IFNEEDED, KSP_GMRES_CGS_REFINE_ALWAYS,
KSPGMRESModifiedGramSchmidtOrthogonalization()
Level
advanced
Location
src/ksp/ksp/guess/../../../../include/petscksp.h
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages