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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