PCGAMGSetCoarseEqLim

Set maximum number of equations on the coarsest grid of PCGAMG

Synopsis

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

Collective

Input Parameters

• pc - the preconditioner context

• n - maximum number of equations to aim for

Options Database Key

• -pc_gamg_coarse_eq_limit - set the limit

Note

For example -pc_gamg_coarse_eq_limit 1000 will stop coarsening once the coarse grid has less than 1000 unknowns.

See Also

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

Level

intermediate

Location

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

Implementations

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

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