DMGetNeighbors#

Gets an array containing the MPI ranks of all the processes neighbors

Synopsis#

#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMGetNeighbors(DM dm, PetscInt *nranks, const PetscMPIInt *ranks[])

Not Collective

Input Parameter#

  • dm - The DM

Output Parameters#

  • nranks - the number of neighbours

  • ranks - the neighbors ranks

Note#

Do not free the array, it is freed when the DM is destroyed.

See Also#

DM Basics, DM, DMDAGetNeighbors(), PetscSFGetRootRanks()

Level#

beginner

Location#

src/dm/interface/dm.c

Examples#

src/dm/tutorials/swarm_ex3.c

Implementations#

DMGetNeighbors_DA() in src/dm/impls/da/dacreate.c
DMGetNeighbors_Plex() in src/dm/impls/plex/plexcreate.c
DMGetNeighbors_Stag() in src/dm/impls/stag/stag.c

Index of all DM routines
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Index of all manual pages