petsc-3.14.6 2021-03-30
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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, DMDirection dir, MPI_Comm *subcomm)
Collective on da

Input Parameters

da - the distributed array
dir - Cartesian direction, either DM_X, DM_Y, or DM_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()

Not supported from Fortran

Level

advanced

Location

src/dm/impls/da/dasub.c

Examples

src/dm/tutorials/ex51.c.html

Index of all DMDA routines
Table of Contents for all manual pages
Index of all manual pages