NAME

       MPI_Dist_graph_create  -   MPI_DIST_GRAPH_CREATE returns a handle to a new communicator to
       which the distributed graph topology information is attached.

SYNOPSIS

       int MPI_Dist_graph_create(MPI_Comm comm_old, int n, const int sources[],
                                 const int degrees[], const int destinations[],
                                 const int weights[],
                                 MPI_Info info, int reorder, MPI_Comm *comm_dist_graph)

INPUT PARAMETERS

       comm_old
              - input communicator (handle)
       n      - number of source nodes for  which  this  process  specifies  edges  (non-negative
              integer)
       sources
              - array containing the n source nodes for which this process specifies edges (array
              of non-negative integers)
       degrees
              - array specifying the number of destinations for each source node  in  the  source
              node array (array of non-negative integers)
       destinations
              -  destination  nodes  for the source nodes in the source node array (array of non-
              negative integers)
       weights
              - weights for source to  destination  edges  (array  of  non-negative  integers  or
              MPI_UNWEIGHTED)
       info   - hints on optimization and interpretation of weights (handle)
       reorder
              - the process may be reordered (true) or not (false) (logical)

OUTPUT PARAMETERS

       comm_dist_graph
              - communicator with distributed graph topology added (handle)

THREAD AND INTERRUPT SAFETY

       This  routine is thread-safe.  This means that this routine may be safely used by multiple
       threads without the need for any user-provided thread locks.  However, the routine is  not
       interrupt  safe.   Typically, this is due to the use of memory allocation routines such as
       malloc or other non-MPICH runtime routines that are themselves not interrupt-safe.

NOTES FOR FORTRAN

       All MPI routines in Fortran (except for MPI_WTIME  and  MPI_WTICK  )  have  an  additional
       argument  ierr  at  the  end  of  the  argument list.  ierr is an integer and has the same
       meaning as the  return  value  of  the  routine  in  C.   In  Fortran,  MPI  routines  are
       subroutines, and are invoked with the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.

ERRORS

       All  MPI  routines  (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as
       the value of the function and Fortran routines in the last argument.  Before the value  is
       returned,  the current MPI error handler is called.  By default, this error handler aborts
       the MPI  job.   The  error  handler  may  be  changed  with  MPI_Comm_set_errhandler  (for
       communicators),  MPI_File_set_errhandler  (for files), and MPI_Win_set_errhandler (for RMA
       windows).  The MPI-1 routine MPI_Errhandler_set may be used but  its  use  is  deprecated.
       The  predefined  error  handler  MPI_ERRORS_RETURN may be used to cause error values to be
       returned.  Note that MPI does not guarentee that an  MPI  program  can  continue  past  an
       error; however, MPI implementations will attempt to continue whenever possible.

       MPI_SUCCESS
              - No error; MPI routine completed successfully.
       MPI_ERR_ARG
              -  Invalid  argument.  Some argument is invalid and is not identified by a specific
              error class (e.g., MPI_ERR_RANK ).
       MPI_ERR_OTHER
              - Other error; use MPI_Error_string to get more information about this error code.

LOCATION

       src/mpi/topo/dist_gr_create.c

                                            4/24/2013                    MPI_Dist_graph_create(3)