PCGAMGASMSetUseAggs

Have the PCGAMG smoother on each level use PCASM where the aggregates defined by the coarsening process are the subdomains for the additive Schwarz preconditioner used as the smoother

Synopsis

#include "petscpc.h" 
#include "petscksp.h" 
PetscErrorCode PCGAMGASMSetUseAggs(PC pc, PetscBool flg)

Collective

Input Parameters

• pc - the preconditioner context

• flg - PETSC_TRUE to use aggregates, PETSC_FALSE to not

Options Database Key

• -pc_gamg_asm_use_agg <true,false> - use aggregates to define the additive Schwarz subdomains

Note

This option automatically sets the preconditioner on the levels to be PCASM.

See Also

the Users Manual section on PCGAMG, the Users Manual section on PCMG, KSP: Linear System Solvers, PCGAMG, PCASM, PCSetType

Level

intermediate

Location

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

Implementations

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

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