mpi_graph_map(3openmpi) [osx man page]

MPI_Graph_map(3OpenMPI) 												   MPI_Graph_map(3OpenMPI)

NAME

       MPI_Graph_map  - Maps process to graph topology information.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Graph_map(MPI_Comm comm, int nnodes, int *index,
	    int *edges, int *newrank)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_GRAPH_MAP(COMM, NNODES, INDEX, EDGES, NEWRANK, IERROR)
	    INTEGER   COMM, NNODES, INDEX(*), EDGES(*), NEWRANK, IERROR

C++ Syntax
       #include <mpi.h>
       int Graphcomm::Map(int nnodes, const int index[],
	    const int edges[]) const

INPUT PARAMETERS

       comm	 Input communicator (handle).

       nnodes	 Number of graph nodes (integer).

       index	 Integer array specifying the graph structure, see  MPI_Graph_ create.

       edges	 Integer array specifying the graph structure.

OUTPUT PARAMETERS

       newrank	 Reordered rank of the calling process; MPI_UNDEFINED if the calling process does not belong to graph (integer).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       MPI_Cart_map  and  MPI_Graph_map  can  be  used	to  implement all other topology functions. In general they will not be called by the user
       directly, unless he or she is creating additional virtual topology capability other than that provided by MPI.

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_Cart_map

Open MPI 1.2							  September 2006					   MPI_Graph_map(3OpenMPI)

MPI_Cart_map(3OpenMPI)													    MPI_Cart_map(3OpenMPI)

NAME

       MPI_Cart_map  -	Maps process to Cartesian topology information.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Cart_map(MPI_Comm comm, int ndims, int *dims,
	    int *periods, int *newrank)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_CART_MAP(COMM, NDIMS, DIMS, PERIODS, NEWRANK, IERROR)
	    INTEGER   COMM, NDIMS, DIMS(*), NEWRANK, IERROR
	    LOGICAL   PERIODS(*)

C++ Syntax
       #include <mpi.h>
       int Cartcomm::Map(int ndims, const int dims[],
	    const bool periods[]) const

INPUT PARAMETERS

       comm	 Input communicator (handle).

       ndims	 Number of dimensions of Cartesian structure (integer).

       dims	 Integer array of size ndims specifying the number of processes in each coordinate direction.

       periods	 Logical array of size ndims specifying the periodicity specification in each coordinate direction.

OUTPUT PARAMETERS

       newrank	 Reordered rank of the calling process; MPI_UNDEFINED if calling process does not belong to grid (integer).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       MPI_Cart_map  and  MPI_Graph_map  can  be  used	to  implement all other topology functions. In general they will not be called by the user
       directly, unless he or she is creating additional virtual topology capability other than that provided by MPI.

       MPI_Cart_map computes an "optimal" placement for the calling process on the physical machine. A possible implementation of this function is
       to always return the rank of the calling process, that is, not to perform any reordering.

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_map

Open MPI 1.2							  September 2006					    MPI_Cart_map(3OpenMPI)