petsc-3.5.2 2014-09-08
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PCMGSetLevels

Sets the number of levels to use with MG. Must be called before any other MG routine.

Synopsis

#include "petscksp.h" 
PetscErrorCode  PCMGSetLevels(PC pc,PetscInt levels,MPI_Comm *comms)
Logically Collective on PC

Input Parameters

pc - the preconditioner context
levels - the number of levels
comms - optional communicators for each level; this is to allow solving the coarser problems on smaller sets of processors. Use NULL_OBJECT for default in Fortran

Notes

If the number of levels is one then the multigrid uses the -mg_levels prefix for setting the level options rather than the -mg_coarse prefix.

Keywords

MG, set, levels, multigrid

See Also

PCMGSetType(), PCMGGetLevels()

Level:intermediate
Location:
src/ksp/pc/impls/mg/mg.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/ksp/ksp/examples/tutorials/ex42.c.html