MPI_Reduce_scatter(3)

NAME
     MPI_Reduce_scatter - Combines values and scatters the results

SYNOPSIS
     C:

          #include <mpi.h>

          int MPI_Reduce_scatter ( sendbuf, recvbuf, recvcnts,
          datatype, op, comm )
          void             *sendbuf;
          void             *recvbuf;
          int              *recvcnts;
          MPI_Datatype      datatype;
          MPI_Op            op;
          MPI_Comm          comm;


     C++:

          #include <mpi.h>

          void Intracomm::Reduce_scatter(
          const void*       sendbuf,
          void*             recvbuf,
          int               recvcounts[],
          const Datatype&   datatype,
          const Op&         op) const


     Fortran:

          INCLUDE "mpif.h" (or USE MPI)

          <type> SENDBUF(*), RECVBUF(*)
          INTEGER recvcounts(*), datatype, op, comm, ierror

          CALL MPI_REDUCE_SCATTER(sendbuf, recvbuf, recvcounts(*), datatype, op, comm, ierror)


STANDARDS
     This release implements the MPI 1.2 standard, as documented by the MPI
     Forum in the spring 1997 release of MPI:  A Message Passing Interface
     Standard.

DESCRIPTION
     The MPI_Reduce_scatter routine combines values and scatters the results.
     This routine accepts the following parameters:

     sendbuf        Specifies the starting address of the send buffer (choice)
     recvcnts       Specifies the integer array that specifies the number of
                    elements in the result that is distributed to each
                    process.  The array must be identical on all calling
                    processes.

     datatype       Specifies the data type of elements of the input buffer
                    (handle)

     op             Specifies the operation (handle)

     comm           Specifies the communicator (handle)

     recvbuf        Returns the starting address of the receive buffer
                    (choice)

     ierror         Specifies the return code value for successful completion,
                    which is in MPI_SUCCESS.  MPI_SUCCESS is defined in the
                    mpif.h file.