PCGAMGSetRepartition

Repartition the degrees of freedom across the processors on the coarser grids when reducing the number of MPI ranks to use

Synopsis

#include "petscpc.h" 
#include "petscksp.h" 
PetscErrorCode PCGAMGSetRepartition(PC pc, PetscBool n)

Collective

Input Parameters

• pc - the preconditioner context

• n - PETSC_TRUE or PETSC_FALSE

Options Database Key

• -pc_gamg_repartition <true,false> - turn on the repartitioning

Note

This will generally improve the loading balancing of the work on each level so the solves will be faster but it adds to the preconditioner setup time.

See Also

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

Level

intermediate

Location

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

Implementations

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

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