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
v - 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#
the Users Manual section on PCGAMG, the Users Manual section on PCMG, KSP: Linear System Solvers, PCGAMG, PCGAMGSetThreshold()
Level#
advanced
Location#
Implementations#
PCGAMGSetThresholdScale_GAMG() in src/ksp/pc/impls/gamg/gamg.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages