petsc-3.9.4 2018-09-11
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
KSPGMRESClassicalGramSchmidtOrthogonalization(), KSPGMRESSetOrthogonalization(), KSPGMRESGetOrthogonalization(),
KSPGMRESSetCGSRefinementType(), KSPGMRESGetCGSRefinementType(), KSP_GMRES_CGS_REFINE_NEVER, 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