PCGAMGSetAggressiveLevels#
Use aggressive coarsening on first n levels
Synopsis#
#include "petscpc.h"
PetscErrorCode PCGAMGSetAggressiveLevels(PC pc, PetscInt n)
Logically Collective
Input Parameters#
pc - the preconditioner context
n - 0, 1 or more
Options Database Key#
-pc_gamg_aggressive_coarsening <n,default = 1> - the flag
Note#
By default, aggressive coarsening squares the matrix (computes \( A^T A\)) before coarsening. Calling PCGAMGSetAggressiveSquareGraph() with a value of PETSC_FALSE changes the aggressive coarsening strategy to use MIS-k, see PCGAMGMISkSetAggressive().
See Also#
the Users Manual section on PCGAMG, the Users Manual section on PCMG, KSP: Linear System Solvers, PCGAMG, PCGAMGSetThreshold(), PCGAMGMISkSetAggressive(), PCGAMGSetAggressiveSquareGraph(), PCGAMGMISkSetMinDegreeOrdering(), PCGAMGSetLowMemoryFilter()
Level#
intermediate
Location#
Implementations#
PCGAMGSetAggressiveLevels_AGG() in src/ksp/pc/impls/gamg/agg.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages