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#

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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