PCGAMGSetThresholdScale#

Relative threshold reduction at each level

Synopsis#

#include "petscpc.h" 
#include "petscksp.h" 
PetscErrorCode PCGAMGSetThresholdScale(PC pc, PetscReal v)

Not Collective

Input Parameters#

pc - the preconditioner context
scale - the threshold value reduction, usually < 1.0

Options Database Key#

-pc_gamg_threshold_scale - set the relative threshold reduction on each level

Note#

The initial threshold (for an arbitrary number of levels starting from the finest) can be set with PCGAMGSetThreshold(). This scaling is used for each subsequent coarsening, but must be called before PCGAMGSetThreshold().

Level#

advanced

Location#

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

Implementations#

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

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