PCGAMGSetRankReductionFactors

Set a manual schedule for MPI rank reduction on coarse grids

Synopsis

#include "petscpc.h" 
#include "petscksp.h" 
PetscErrorCode PCGAMGSetRankReductionFactors(PC pc, PetscInt v[], PetscInt n)

Collective

Input Parameters

• pc - the preconditioner context

• v - array of reduction factors. 0 for first value forces a reduction to one process/device on first level in CUDA

• n - number of values provided in array

Options Database Key

• -pc_gamg_rank_reduction_factors - provide the schedule

See Also

PCGAMG, PCGAMGSetProcEqLim(), PCGAMGSetCoarseEqLim()

Level

intermediate

Location

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

Implementations

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

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