mpi_graph_neighbors_count(3openmpi) [osx 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)

MPI_Cart_coords(3OpenMPI)												 MPI_Cart_coords(3OpenMPI)

NAME

       MPI_Cart_coords - Determines process coords in Cartesian topology given rank in group.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Cart_coords(MPI_Comm comm, int rank, int maxdims,
	    int *coords)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_CART_COORDS(COMM, RANK, MAXDIMS, COORDS, IERROR)
	    INTEGER   COMM, RANK, MAXDIMS, COORDS(*), IERROR

C++ Syntax
       #include <mpi.h>
       void Cartcomm::Get_coords(int rank, int maxdims,
	    int coords[]) const

INPUT PARAMETERS

       comm	 Communicator with Cartesian structure (handle).

       rank	 Rank of a process within group of comm (integer).

       maxdims
		  Length of vector coord in the calling program (integer).

OUTPUT PARAMETERS

       coords	 Integer array (of size ndims,which was defined by MPI_Cart_create call) containing the Cartesian coordinates of specified process
		 (integer).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       The inverse mapping, rank-to-coordinates translation is provided by MPI_Cart_coords.

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.

Open MPI 1.2							  September 2006					 MPI_Cart_coords(3OpenMPI)