PCAIRSetDDCFraction

Sets the fraction of local F points converted to C points by diagonal dominance in the PCAIR CF_PMISR_DDC CF splitting

Synopsis

PETSC_EXTERN PetscErrorCode PCAIRSetDDCFraction(PC pc, PetscReal input_real)

Logically Collective

Input Parameters

• pc - the PCAIR preconditioner context

• input_real - the local fraction of F points to convert to C points, or (if negative) minus the diagonal-dominance ratio threshold

Options Database Key

• -pc_air_ddc_fraction fraction - local fraction of F points converted to C by diagonal dominance; if negative, convert any row whose diagonal-dominance ratio is less than the absolute value; defaults to 0.1

Note

Only used by the CF_PMISR_DDC CF splitting type (see PCAIRSetCFSplittingType()).

See Also

KSP: Linear System Solvers, PCAIR, PCAIRGetDDCFraction(), PCAIRSetDDCIts(), PCAIRSetCFSplittingType(), CFSplittingType

Level

advanced

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