KSPSetUsePreconditionedResidual
Sets a flag so that the two norm of the preconditioned residual is used rather than the true residual, in the default convergence tests.
Synopsis
int KSPSetUsePreconditionedResidual(KSP ksp)
Collective on
KSP
Input Parameter
ksp -iterative context obtained from KSPCreate()
Notes
Currently only CG, CHEBYCHEV, and RICHARDSON use this with
leftpreconditioning. All other methods always used the
preconditionedresidual. With right preconditioning this flag is ignored,
sincethe preconditioned residual and true residual are the same.
Options Database Key
-ksp_preres -Activates KSPSetUsePreconditionedResidual()
Keywords
KSP, set, residual, precondition, flag
Location: src/ksp/interface/itfunc.c
KSP Index
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