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.
10 /* transposes a matrix using passive target RMA and derived
11 datatypes. Uses vector and hvector (Example 3.32 from MPI 1.1
12 Standard). Run on 2 processes. */
17 int main(int argc, char *argv[])
19 int rank, nprocs, A[NROWS][NCOLS], i, j;
22 MPI_Datatype column, xpose;
25 MTest_Init(&argc, &argv);
26 MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
27 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
30 printf("Run this program with 2 or more processes\n");
31 MPI_Abort(MPI_COMM_WORLD, 1);
34 MPI_Comm_split(MPI_COMM_WORLD, (rank < 2), rank, &CommDeuce);
38 for (i = 0; i < NROWS; i++)
39 for (j = 0; j < NCOLS; j++)
40 A[i][j] = i * NCOLS + j;
42 /* create datatype for one column */
43 MPI_Type_vector(NROWS, 1, NCOLS, MPI_INT, &column);
44 /* create datatype for matrix in column-major order */
45 MPI_Type_hvector(NCOLS, 1, sizeof(int), column, &xpose);
46 MPI_Type_commit(&xpose);
48 MPI_Win_create(NULL, 0, 1, MPI_INFO_NULL, CommDeuce, &win);
50 MPI_Win_lock(MPI_LOCK_SHARED, 1, 0, win);
52 MPI_Put(A, NROWS * NCOLS, MPI_INT, 1, 0, 1, xpose, win);
54 MPI_Type_free(&column);
55 MPI_Type_free(&xpose);
57 MPI_Win_unlock(1, win);
61 for (i = 0; i < NROWS; i++)
62 for (j = 0; j < NCOLS; j++)
64 MPI_Win_create(A, NROWS * NCOLS * sizeof(int), sizeof(int), MPI_INFO_NULL, CommDeuce,
69 for (j = 0; j < NCOLS; j++)
70 for (i = 0; i < NROWS; i++)
71 if (A[j][i] != i * NCOLS + j) {
72 printf("Error: A[%d][%d]=%d should be %d\n", j, i, A[j][i], i * NCOLS + j);
78 MPI_Comm_free(&CommDeuce);