NAME

       MPI_Dist_graph_create_adjacent  -   returns  a  handle  to a new communicator to which the
       distributed graph topology information is attached

SYNOPSIS

       int MPI_Dist_graph_create_adjacent(MPI_Comm comm_old, int indegree, const int sources[],
       const int sourceweights[], int outdegree,
       const int destinations[], const int destweights[], MPI_Info info,
       int reorder, MPI_Comm *comm_dist_graph)

INPUT PARAMETERS

       comm_old
              - input communicator (handle)
       indegree
              - size of sources and sourceweights arrays (non-negative integer)
       sources
              - ranks of processes for which the calling process is a  destination  (non-negative
              integer)
       sourceweights
              - weights of the edges into the calling process (non-negative integer)
       outdegree
              - size of destinations and destweights arrays (non-negative integer)
       destinations
              -  ranks  of  processes  for  which  the  calling process is a source (non-negative
              integer)
       destweights
              - weights of the edges out of the calling process (non-negative integer)
       info   - hints on optimization and interpretation of weights (handle)
       reorder
              - the ranks may be reordered (true) or not~(false) (logical)

OUTPUT PARAMETERS

       comm_dist_graph
              - communicator with distributed graph topology (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  guarantee 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_COMM
              -  Invalid  communicator.   A  common error is to use a null communicator in a call
              (not even allowed in MPI_Comm_rank ).
       MPI_ERR_INFO
              - Invalid Info
       MPI_ERR_OTHER
              - Other error; use MPI_Error_string to get more information about this error code.

                                            2/22/2022           MPI_Dist_graph_create_adjacent(3)