MPI_Accumulate

accumulate

Synopsis

int MPI_Accumulate(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) 

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)

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 deprecatd. 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.

MPI_SUCCESS
No error; MPI routine completed successfully.

Location:accumulate.c