PCGAMGSetProcEqLim

Set number of equations to aim for per process on the coarse grids via processor reduction in PCGAMG

Synopsis

#include "petscpc.h" 
#include "petscksp.h" 
PetscErrorCode PCGAMGSetProcEqLim(PC pc, PetscInt n)

Logically Collective

Input Parameters

• pc - the preconditioner context

• n - the number of equations

Options Database Key

• -pc_gamg_process_eq_limit - set the limit

Note

PCGAMG will reduce the number of MPI processes used directly on the coarse grids so that there are around equations on each process that has degrees of freedom

Developer Note

Should be named PCGAMGSetProcessEquationLimit().

See Also

the Users Manual section on PCGAMG, the Users Manual section on PCMG, KSP: Linear System Solvers, PCGAMG, PCGAMGSetCoarseEqLim(), PCGAMGSetRankReductionFactors(), PCGAMGSetRepartition()

Level

intermediate

Location

src/ksp/pc/impls/gamg/gamg.c

Implementations

PCGAMGSetProcEqLim_GAMG() in src/ksp/pc/impls/gamg/gamg.c

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