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NAME

       MPI_Accumulate -  Accumulates data into a window

SYNOPSIS

       #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)

INPUT PARAMETERS

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

NOTES

       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.)

NOTES FOR FORTRAN

       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.

ERRORS

       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.
       MPI_SUCCESS
              - No error; MPI routine completed successfully.
       MPI_ERR_WIN
              -  Invalid  window.  A common error is to use a null window in a
              call.
       MPI_ERR_TYPE
              - Invalid datatype argument.  May be an uncommitted MPI_Datatype
              (see MPI_Type_commit ).
       MPI_ERR_EPOCH
              - 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.
       MPI_ERR_INTERN
              - 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 ).
       MPI_ERR_TYPENOTSUP
              - 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.

SEE ALSO

       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), MPI_Win_wait(3)

MORE INFORMATION

       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).

       http://www.mpi-forum.org/

LOCATION

       accumulate.c