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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 topol-ogy. topology.
       ogy.


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++ functions 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)