petsc-master 2014-09-19
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PCGASMCreateLocalSubdomains

Creates n local index sets for the overlapping Schwarz preconditioner for a any problem based on its matrix.

Synopsis

#include "petscpc.h" 
PetscErrorCode  PCGASMCreateLocalSubdomains(Mat A, PetscInt overlap, PetscInt n, IS *iis[], IS *ois[])
Collective

Input Parameters

A - The global matrix operator
overlap - amount of overlap in outer subdomains
n - the number of local subdomains

Output Parameters

iis - the array of index sets defining the local inner subdomains (on which the correction is applied)
ois - the array of index sets defining the local outer subdomains (on which the residual is computed)

Note: this generates n nonoverlapping local inner subdomains on PETSC_COMM_SELF; PCGASM will generate the overlap from these if you use them in PCGASMSetSubdomains() and set a nonzero overlap with PCGASMSetOverlap()

In the Fortran version you must provide the array outis[] already allocated of length n.

Keywords

PC, GASM, additive Schwarz, create, subdomains, unstructured grid

See Also

PCGASMSetSubdomains(), PCGASMDestroySubdomains()

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