PCAIRSetSubcomm

Sets whether PCAIR performs reductions for arnoldi or newton polynomial inverses on a subcommunicator that excludes empty MPI ranks

Synopsis

PETSC_EXTERN PetscErrorCode PCAIRSetSubcomm(PC pc, PetscBool input_bool)

Logically Collective

Input Parameters

• pc - the PCAIR preconditioner context

• input_bool - PETSC_TRUE to perform the reductions on a subcommunicator excluding ranks with no rows

Options Database Key

• -pc_air_subcomm (true|false) - perform reductions for arnoldi/newton polynomial inverses on a subcommunicator excluding empty ranks; defaults to false

Note

Only relevant after processor agglomeration (see PCAIRSetProcessorAgglom()) has left some MPI ranks with no rows, and only affects the basis-building reductions of the PFLAREINV_ARNOLDI, PFLAREINV_NEWTON, and PFLAREINV_NEWTON_NO_EXTRA polynomial inverse types (see PCAIRSetInverseType()). It does not apply to the PFLAREINV_POWER basis, which needs no such reductions; enabling it with the power basis is an error.

See Also

KSP: Linear System Solvers, PCAIR, PCAIRGetSubcomm(), PCAIRSetProcessorAgglom(), PCAIRSetInverseType()

Level

advanced

Index of all PC routines
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Index of all manual pages