1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
3 * (C) 2001 by Argonne National Laboratory.
4 * See COPYRIGHT in top-level directory.
11 int main(int argc, char *argv[])
16 int buf[BUFSIZE], *bptr, bl, i, j, rank, size, color, errs = 0;
19 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
21 MPI_Comm_split(MPI_COMM_WORLD, color, rank, &scomm);
22 MPI_Intercomm_create(scomm, 0, MPI_COMM_WORLD, 1 - color, 52, &comm);
23 MPI_Comm_rank(comm, &rank);
24 MPI_Comm_remote_size(comm, &size);
25 MPI_Buffer_attach(buf, BUFSIZE);
27 for (j = 0; j < 10; j++) {
28 for (i = 0; i < 10; i++) {
29 a[i] = (rank + 10 * j) * size + i;
31 MPI_Bsend(a, 10, MPI_INT, 0, 27 + j, comm);
35 for (i = 0; i < size; i++) {
36 for (j = 0; j < 10; j++) {
39 status.MPI_SOURCE = -20;
40 MPI_Recv(b, 10, MPI_INT, i, 27 + j, comm, &status);
42 if (status.MPI_TAG != 27 + j) {
44 printf("Wrong tag = %d\n", status.MPI_TAG);
46 if (status.MPI_SOURCE != i) {
48 printf("Wrong source = %d\n", status.MPI_SOURCE);
50 for (k = 0; k < 10; k++) {
51 if (b[k] != (i + 10 * j) * size + k) {
53 printf("received b[%d] = %d from %d tag %d\n", k, b[k], i, 27 + j);
59 MPI_Buffer_detach(&bptr, &bl);
61 MPI_Comm_free(&scomm);