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       MPI_Accumulate -  Accumulates data into a window


       #include <mpi.h>
       int MPI_Accumulate(void *orgaddr, int orgcnt, MPI_Datatype orgtype, int rank,
                         MPI_Aint targdisp, int targcnt, MPI_Datatype targtype,
                         MPI_Op op, MPI_Win win)


              - initial address of buffer (choice)
       orgcnt - number of entries in buffer (nonnegative integer)
              - datatype of each buffer entry (handle)
       rank   - rank of target (nonnegative integer)
              -  displacement  from  start  of  window to beginning of target buffer (nonnegative
              - datatype of each entry in target buffer (handle)
       op     - reduce operation (handle)
       win    - window object (handle)


       MPI_PUT is a special  case  of  MPI_ACCUMULATE,  with  the  operation  MPI_REPLACE.  Note,
       however, that MPI_PUT and MPI_ACCUMULATE have different constraints on concurrent updates.
       ( End of advice to users.)


       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.


       If  an  error occurs in an MPI function, the current MPI error handler is called to handle
       it.  By default, this error handler aborts the MPI job.  The error handler may be  changed
       with  MPI_Errhandler_set  ;  the predefined error handler MPI_ERRORS_RETURN may be used to
       cause error values to be returned (in C and Fortran; this error handler is less useful  in
       with  the  C++  MPI  bindings.   The predefined error handler MPI::ERRORS_THROW_EXCEPTIONS
       should be used in C++ if the error value needs to be recovered).  Note that MPI  does  not
       guarantee that an MPI program can continue past an error.

       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.  The C++ bindings for
       MPI  do  not  return  error  values;  instead,  error  values are communicated by throwing
       exceptions of type MPI::Exception (but not by default).  Exceptions are only thrown if the
       error value is not MPI::SUCCESS .

       Note that if the MPI::ERRORS_RETURN handler is set in C++, while MPI functions will return
       upon an error, there will be no way to recover what the actual error value was.
              - No error; MPI routine completed successfully.
              - Invalid window.  A common error is to use a null window in a call.
              -  Invalid  datatype  argument.   May   be   an   uncommitted   MPI_Datatype   (see
              MPI_Type_commit ).
              -  This  error indicates than an operation has been attempted on a "closed" window.
              Certain one-sided operations can only be performed on windows whose epoch has  been
              started with MPI_Win_start.
              - An internal error has been detected.  This is fatal.  Please send a bug report to
              the LAM mailing list (see ).
              - Type not  supported  for  this  operation.   This  typically  applies  to  either
              reduction  operations  (for  which  only  a  limited  combination  of datatypes and
              operations are defined, see MPI-1, section 4.9.2) or one-sided operations where the
              actions on specific datatpyes have not been implemented yet.


       MPI_Put(3),    MPI_Get(3),   MPI_Win_create(3),   MPI_Win_start(3),   MPI_Win_complete(3),
       MPI_Win_fence(3),     MPI_Win_free(3),     MPI_Win_get_group(3),     MPI_Win_get_group(3),


       For  more information, please see the official MPI Forum web site, which contains the text
       of both the MPI-1 and MPI-2 standards.  These documents contain detailed information about
       each MPI function (most of which is not duplicated in these man pages).