PCBDDCSetCoarseningRatio

Sets the coarsening ratio used by multilevel PCBDDC

Synopsis

#include "petscpc.h" 
PetscErrorCode PCBDDCSetCoarseningRatio(PC pc, PetscInt k)

Logically Collective

Input Parameters

• pc - the preconditioning context

• k - target number of process subdomains or local elements per aggregate

Options Database Key

• -pc_bddc_coarsening_ratio k - set the coarsening ratio used in multilevel coarsening

Note

Approximately k subdomains at the finer level are aggregated into a single subdomain at the coarser level. When a local MATIS matrix stores multiple elements, k is the target number of local elements per aggregate.

See Also

KSP: Linear System Solvers, PCBDDC, PCBDDCSetLevels()

Level

intermediate

Location

src/ksp/pc/impls/bddc/bddc.c

Implementations

PCBDDCSetCoarseningRatio_BDDC() in src/ksp/pc/impls/bddc/bddc.c

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