KSPGMRESModifiedGramSchmidtOrthogonalization

This is the basic orthogonalization routine using modified Gram-Schmidt.

Synopsis

PetscErrorCode KSPGMRESModifiedGramSchmidtOrthogonalization(KSP ksp, PetscInt it)

Collective

Input Parameters

• ksp - KSP object, must be associated with KSPGMRES, KSPFGMRES, or KSPLGMRES Krylov method

• it - one less than the current GMRES restart iteration, i.e. the size of the Krylov space

Options Database Key

• -ksp_gmres_modifiedgramschmidt - Activates KSPGMRESModifiedGramSchmidtOrthogonalization()

Note

In general this is much slower than KSPGMRESClassicalGramSchmidtOrthogonalization() but has better stability properties.

See Also

KSP: Linear System Solvers, KSPGMRESSetOrthogonalization(), KSPGMRESClassicalGramSchmidtOrthogonalization(), KSPGMRESGetOrthogonalization()

Level

intermediate

Location

src/ksp/ksp/impls/gmres/borthog.c

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