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#
the Users Manual section on PCGAMG, the Users Manual section on PCMG, KSP: Linear System Solvers, PCGAMG, PCGAMGSetProcEqLim(), PCGAMGSetCoarseEqLim(), PCGAMGSetParallelCoarseGridSolve()
Level#
intermediate
Location#
Implementations#
PCGAMGSetRankReductionFactors_GAMG() in src/ksp/pc/impls/gamg/gamg.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages