MPI_Allgather(3)

NAME
     MPI_Allgather - Gathers data from all tasks and distributes it

SYNOPSIS
     C:

          #include <mpi.h>

          int MPI_Allgather ( sendbuf, sendcount, sendtype,
          recvbuf, recvcount, recvtype, comm)
          void             *sendbuf;
          int               sendcount;
          MPI_Datatype      sendtype;
          void             *recvbuf;
          int               recvcount;
          MPI_Datatype      recvtype;
          MPI_Comm          comm;


     C++:

          #include <mpi.h>

          void Intracomm::Allgather(
          const void*       sendbuf,
          int               sendcount,
          const Datatype&   sendtype,
          void*             recvbuf,
          int               recvcount,
          const Datatype&   recvtype) const


     Fortran:

          INCLUDE "mpif.h" (or USE MPI)

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

          CALL MPI_ALLGATHER(sendbuf, recvbuf, sendcount,
          sendtype, recvcount, 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.
DESCRIPTION
     The MPI_Allgather routine gathers data from all tasks and distributes 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)

     recvcount      Specifies the number of elements received from any process
                    (integer)

     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.