DAGetProcessorSubset

Returns a communicator consisting only of the processors in a DA that own a particular global x, y, or z grid point (corresponding to a logical plane in a 3D grid or a line in a 2D grid).

Synopsis

#include "petscda.h"   
int DAGetProcessorSubset(DA da,DADirection dir,int gp,MPI_Comm *comm)
Collective on DA

Input Parameters

da - the distributed array
dir - Cartesian direction, either DA_X, DA_Y, or DA_Z
gp - global grid point number in this direction

Output Parameters

comm -new communicator

Notes

This routine is particularly useful to compute boundary conditions or other application-specific calculations that require manipulating sets of data throughout a logical plane of grid points.

Keywords

distributed array, get, processor subset

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