MPI_Allgatherv - Gathers data from all tasks and delivers
       it


SYNOPSIS

       C:

            #include <mpi.h>

            int MPI_Allgatherv ( sendbuf, sendcount,  sendtype,
            recvbuf, recvcounts, displs,
            recvtype, comm )
            void             *sendbuf;
            int               sendcount;
            MPI_Datatype      sendtype;
            void             *recvbuf;
            int              *recvcounts;
            int              *displs;
            MPI_Datatype      recvtype;
            MPI_Comm          comm;

       C++:

            #include <mpi.h>

            void Intracomm::Allgatherv(
            const void*       sendbuf,
            int               sendcount,
            const Datatype&   sendtype,
            void*             recvbuf,
            const int         recvcounts[],
            const int         displs[],
            const Datatype&   recvtype) const

       Fortran:

            INCLUDE "mpif.h" (or USE MPI)

            <type> SENDBUF(*), RECVBUF(*)
            INTEGER sendcount, sendtype, recvcounts(*), displs(*),
            recvtype, comm, ierror

            CALL MPI_ALLGATHERV(sendbuf, sendcount, sendtype,
            recvbuf, recvcounts(*), displs(*), recvtype,
            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.

       The MPI_Allgatherv routine gathers data from all tasks and
       delivers it to all.  This routine accepts the following
       parameters:

       sendbuf        Specifies the starting address of the send
                      buffer (choice).

       sendcount      Specifies the number of elements in the
                      send buffer (integer).

       sendtype       Specifies the data type of the send buffer
                      elements (handle).

       recvcounts     Specifies the integer array (of length
                      group size, specified in comm) containing
                      the number of elements that are received
                      from each process.

       displs         Specifies the integer array (of length
                      group size, specified in comm). Entry i
                      specifies the displacement (relative to
                      recvbuf ) at which to place the incoming
                      data from process i.

       recvtype       Specifies the data type of the receive
                      buffer elements (handle).

       comm           Specifies the communicator (handle).

       recvbuf        Returns the 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.


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