DMDAGetProcessorSubset#
Returns a communicator consisting only of the processors in a DMDA 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 "petscdmda.h"
PetscErrorCode DMDAGetProcessorSubset(DM da, DMDirection dir, PetscInt gp, MPI_Comm *comm)
Collective on da
Input Parameters#
da - the distributed array
dir - Cartesian direction, either DM_X, DM_Y, or DM_Z
gp - global grid point number in this direction
Output Parameter#
comm - new communicator
Notes#
All processors that share the DMDA must call this with the same gp value
After use, comm should be freed with MPI_Comm_free()
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.
Not supported from Fortran
Level#
advanced
Location#
Examples#
Index of all DMDA routines
Table of Contents for all manual pages
Index of all manual pages