MPI_Graph_neighbors function

Returns the neighbors of a node associated with a graph topology.

Syntax

int MPIAPI MPI_Graph_neighbors(
   MPI_Comm                    comm,
   int                         rank,
   int                         maxneighbors,
   _Out_cap_(maxneighbors) int *neighbors
);

Parameters

• comm
  Communicator with graph topology.

• rank
  Rank of process in group of comm.

• maxneighbors
  Size of array neighbors.

• neighbors
  Ranks of processes that are neighbors to specified process.

Return value

Returns MPI_SUCCESS on success. Otherwise, the return value is an error code.

In Fortran, the return value is stored in the IERROR parameter.

Fortran

    MPI_GRAPH_NEIGHBORS(COMM, RANK, MAXNEIGHBORS, NEIGHBORS, IERROR)
        INTEGER COMM, RANK, MAXNEIGHBORS, NEIGHBORS(*), IERROR

Requirements

See also

MPI Process Topology Functions