PCGAMGSetProlongatorFilter

Set threshold for filtering small entries from the prolongator (a kernel-preserving correction is applied afterward)

Synopsis

#include "petscpc.h" 
PetscErrorCode PCGAMGSetProlongatorFilter(PC pc, PetscReal thr)

Logically Collective

Input Parameters

• pc - the preconditioner context

• thr - threshold value; entries with absolute value below this are dropped (0 disables filtering)

Options Database Key

• -pc_gamg_prolongator_filter thr - threshold for filtering small entries from prolongator (0=disabled, 0.0025=typical)

See Also

the Users Manual section on PCGAMG, the Users Manual section on PCMG, KSP: Linear System Solvers, PCGAMG, PCGAMGGetProlongatorFilter(), PCGAMGSetLowMemoryFilter()

Level

intermediate

Location

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

Implementations

PCGAMGSetProlongatorFilter_AGG() in src/ksp/pc/impls/gamg/agg.c

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