petsc-3.7.5 2017-01-01

SNESFASSetLevels

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

#include "petscsnes.h"  
PetscErrorCode SNESFASSetLevels(SNES snes, PetscInt levels, MPI_Comm * comms)

	snes	- the snes 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.

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

FAS, MG, set, levels, multigrid