1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
4 * (C) 2003 by Argonne National Laboratory.
5 * See COPYRIGHT in top-level directory.
13 #define MAX_INT 0x7fffffff
17 static char MTEST_Descrip[] = "Test MPI_Accumulate with fence";
20 int main( int argc, char *argv[] )
23 int rank, size, source;
24 int minsize = 2, count, i;
29 MTest_Init( &argc, &argv );
31 /* The following illustrates the use of the routines to
32 run through a selection of communicators and datatypes.
33 Use subsets of these for tests that do not involve combinations
34 of communicators, datatypes, and counts of datatypes */
35 while (MTestGetIntracommGeneral( &comm, minsize, 1 )) {
36 if (comm == MPI_COMM_NULL) continue;
37 /* Determine the sender and receiver */
38 MPI_Comm_rank( comm, &rank );
39 MPI_Comm_size( comm, &size );
42 for (count = 1; count < 65000; count = count * 2) {
43 /* We compare with an integer value that can be as large as
44 size * (count * count + (1/2)*(size-1))
45 For large machines (size large), this can exceed the
46 maximum integer for some large values of count. We check
47 that in advance and break this loop if the above value
48 would exceed MAX_INT. Specifically,
50 size*count*count + (1/2)*size*(size-1) > MAX_INT
51 count*count > (MAX_INT/size - (1/2)*(size-1))
53 if (count * count > (MAX_INT/size - (size-1)/2)) break;
54 winbuf = (int *)malloc( count * sizeof(int) );
55 sbuf = (int *)malloc( count * sizeof(int) );
57 for (i=0; i<count; i++) winbuf[i] = 0;
58 for (i=0; i<count; i++) sbuf[i] = rank + i * count;
59 MPI_Win_create( winbuf, count * sizeof(int), sizeof(int),
60 MPI_INFO_NULL, comm, &win );
61 MPI_Win_fence( 0, win );
62 MPI_Accumulate( sbuf, count, MPI_INT, source, 0, count, MPI_INT,
64 MPI_Win_fence( 0, win );
66 /* Check the results */
67 for (i=0; i<count; i++) {
68 int result = i * count * size + (size*(size-1))/2;
69 if (winbuf[i] != result) {
71 fprintf( stderr, "Winbuf[%d] = %d, expected %d (count = %d, size = %d)\n",
72 i, winbuf[i], result, count, size );
85 MTest_Finalize( errs );