petsc-3.9.4 2018-09-11
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PCGAMGSetThreshold

 Relative threshold to use for dropping edges in aggregation graph

Synopsis

#include "petscpc.h" 
PetscErrorCode PCGAMGSetThreshold(PC pc, PetscReal v[], PetscInt n)
Not collective on PC

Input Parameters

pc - the preconditioner context
threshold - the threshold value, 0.0 means keep all nonzero entries in the graph; negative means keep even zero entries in the graph

Options Database Key

-pc_gamg_threshold <threshold> - Notes: Before aggregating the graph GAMG will remove small values from the graph thus reducing the coupling in the graph and a different (perhaps better) coarser set of points.

See Also

PCGAMGFilterGraph()

Level

intermediate

Location

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

Implementations

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

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