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mpi_graph_get(3openmpi) [osx man page]

MPI_Graph_get(3OpenMPI) 												   MPI_Graph_get(3OpenMPI)

NAME

       MPI_Graph_get  - Retrieves graph topology information associated with a communicator.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Graph_get(MPI_Comm comm, int maxindex, int maxedges,
	    int *index, int *edges)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_GRAPH_GET(COMM, MAXINDEX, MAXEDGES, INDEX, EDGES, IERROR)
	    INTEGER   COMM, MAXINDEX, MAXEDGES, INDEX(*)
	    INTEGER   EDGES(*), IERROR

C++ Syntax
       #include <mpi.h>
       void Graphcomm::Get_topo(int maxindex, int maxedges,
	    int index[], int edges[]) const

INPUT PARAMETERS

       comm	 Communicator with graph structure (handle).

       maxindex  Length of vector index in the calling program (integer).

       maxedges  Length of vector edges in the calling program (integer).

OUTPUT PARAMETERS

       index	 Array of integers containing the graph structure (for details see the definition of MPI_Graph_create).

       edges	 Array of integers containing the graph structure.

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       Functions  MPI_Graphdims_get  and  MPI_Graph_get  retrieve  the	graph-topology	information  that  was	associated  with a communicator by
       MPI_Graph_create.

       The information provided by MPI_Graphdims_get can be used to dimension the vectors index and edges correctly for a call to MPI_Graph_get.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ func-
       tions  do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
       will be used to throw an MPI:Exception object.

       Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except  for
       I/O  function  errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be
       used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.

SEE ALSO

       MPI_Graph_create
       MPI_Graphdims_get

Open MPI 1.2							  September 2006					   MPI_Graph_get(3OpenMPI)

Check Out this Related Man Page

MPI_Graph_neighbors_count(3OpenMPI)									       MPI_Graph_neighbors_count(3OpenMPI)

NAME

       MPI_Graph_neighbors_count  - Returns the number of neighbors of a node associated with a graph topology.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Graph_neighbors_count(MPI_Comm comm, int rank,
	    int *nneighbors)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_GRAPH_NEIGHBORS_COUNT(COMM, RANK, NNEIGHBORS, IERROR)
	    INTEGER   COMM, RANK, NNEIGHBORS, IERROR

C++ Syntax
       #include <mpi.h>
       int Graphcomm::Get_neighbors_count(int rank) const

INPUT PARAMETERS

       comm	 Communicator with graph topology (handle).

       rank	 Rank of process in group of comm (integer).

OUTPUT PARAMETERS

       nneighbors
		 Number of neighbors of specified process (integer).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       MPI_Graph_neighbors_count  and  MPI_Graph_neighbors  provide adjacency information for a general, graph topology. MPI_Graph_neighbors_count
       returns the number of neighbors for the process signified by rank.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ func-
       tions  do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
       will be used to throw an MPI:Exception object.

       Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except  for
       I/O  function  errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be
       used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.

SEE ALSO

       MPI_Graph_neighbors

Open MPI 1.2							  September 2006			       MPI_Graph_neighbors_count(3OpenMPI)
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