man MPI_Raccumulate (3): Accumulate data into the target process using remote memory access and return a request handle for the operation.

SYNOPSIS

int MPI_Raccumulate(const void *origin_addr, int origin_count, MPI_Datatype
origin_datatype, int target_rank, MPI_Aint
target_disp, int target_count, MPI_Datatype
target_datatype, MPI_Op op, MPI_Win win,
MPI_Request *request)

MPI_Raccumulate is similar to MPI_Accumulate , except that it allocates a communication request object and associates it with the request handle (the argument request) that can be used to wait or test for completion. The completion of an MPI_Raccumulate operation indicates that the origin buffer is free to be updated. It does not indicate that the operation has completed at the target window.

INPUT PARAMETERS

origin_addr: - initial address of buffer (choice)
origin_count: - number of entries in buffer (nonnegative integer)
origin_datatype: - datatype of each buffer entry (handle)
target_rank: - rank of target (nonnegative integer)
target_disp: - displacement from start of window to beginning of target buffer (nonnegative integer)
target_count: - number of entries in target buffer (nonnegative integer)
target_datatype: - datatype of each entry in target buffer (handle)
op: - predefined reduce operation (handle)
win: - window object (handle)

OUTPUT PARAMETERS

request: - RMA request (handle)

NOTES

The basic components of both the origin and target datatype must be the same predefined datatype (e.g., all MPI_INT or all MPI_DOUBLE_PRECISION ).

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

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. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error handler may be changed with MPI_Comm_set_errhandler (for communicators), MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler (for RMA windows). The MPI-1 routine MPI_Errhandler_set may be used but its use is deprecated. The predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarentee that an MPI program can continue past an error; however, MPI implementations will attempt to continue whenever possible.