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MPI_Accumulate(3)			     LAM/MPI				MPI_Accumulate(3)

       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,  how-
       ever,  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 argu-
       ment 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 excep-
       tions 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_com-
	      mit ).
	      -  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 http://www.lam-mpi.org/contact.php ).
	      - Type not supported for this operation.	This typically applies to  either  reduc-
	      tion  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).



LAM/MPI 6.5.8				    11/10/2002				MPI_Accumulate(3)
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