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().
See Also#
Level#
advanced
Location#
Implementations#
PCGAMGSetThresholdScale_GAMG in src/ksp/pc/impls/gamg/gamg.c
Index of all PC routines
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Index of all manual pages