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; No Fortran Support

Input Parameters#

  • da - the distributed array

  • dir - Cartesian direction, either DM_X, DM_Y, or DM_Z

Output Parameter#

  • 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()

See Also#

DMDA - Creating vectors for structured grids, DM, DMDA, DMDirection, DMDAGetProcessorSubset(), DM_X, DM_Y, DM_Z

Level#

advanced

Location#

src/dm/impls/da/dasub.c

Examples#

src/dm/tutorials/ex51.c

Index of all DMDA routines
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Index of all manual pages