petsc-3.8.4 2018-03-24
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DMDAGetProcessorSubsets

 Returns communicators consisting only of the processors in a DMDA adjacent in a particular dimension, corresponding to a logical plane in a 3D grid or a line in a 2D grid.

Synopsis

#include "petscdmda.h"   
PetscErrorCode  DMDAGetProcessorSubsets(DM da, DMDADirection dir, MPI_Comm *subcomm)
Collective on DMDA

Input Parameters

da - the distributed array
dir - Cartesian direction, either DMDA_X, DMDA_Y, or DMDA_Z

Output Parameters

subcomm -new communicator

Notes

This routine is useful for distributing one-dimensional data in a tensor product grid.

After use, comm should be freed with MPI_Comm_free()

Keywords

distributed array, get, processor subset

Level:advanced
Location:src/dm/impls/da/dasub.c
Index of all DMDA routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/dm/examples/tutorials/ex51.c.html