PCGAMGGetProlongatorFilter

Get the relative threshold for block filtering of the prolongator

Synopsis

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

Not Collective

Input Parameter

• pc - the preconditioner context

Output Parameter

• thr - relative block-filtering threshold; the block of prolongator entries coupling a fine node to a coarse node is dropped when its Frobenius norm is below thr times the largest such block norm in that fine node’s block row (0 disables filtering, see PCGAMGSetProlongatorFilter())

See Also

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

Level

intermediate

Location

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

Implementations

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

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