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 put, fence, and derived
11 datatypes. Uses vector and struct (Example 3.33 from MPI 1.1
12 Standard). We could use vector and type_create_resized instead. Run
18 int main(int argc, char *argv[])
20 int rank, nprocs, A[NROWS][NCOLS], i, j, blocklen[2];
24 MPI_Datatype column, column1, type[2];
27 MTest_Init(&argc, &argv);
28 MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
29 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
32 printf("Run this program with 2 or more processes\n");
33 MPI_Abort(MPI_COMM_WORLD, 1);
36 MPI_Comm_split(MPI_COMM_WORLD, (rank < 2), rank, &CommDeuce);
40 for (i = 0; i < NROWS; i++)
41 for (j = 0; j < NCOLS; j++)
42 A[i][j] = i * NCOLS + j;
44 /* create datatype for one column */
45 MPI_Type_vector(NROWS, 1, NCOLS, MPI_INT, &column);
47 /* create datatype for one column, with the extent of one
48 * integer. we could use type_create_resized instead. */
50 disp[1] = sizeof(int);
55 MPI_Type_struct(2, blocklen, disp, type, &column1);
56 MPI_Type_commit(&column1);
58 MPI_Win_create(NULL, 0, 1, MPI_INFO_NULL, CommDeuce, &win);
60 MPI_Win_fence(0, win);
62 MPI_Put(A, NROWS * NCOLS, MPI_INT, 1, 0, NCOLS, column1, win);
64 MPI_Type_free(&column);
65 MPI_Type_free(&column1);
67 MPI_Win_fence(0, win);
70 for (i = 0; i < NROWS; i++)
71 for (j = 0; j < NCOLS; j++)
73 MPI_Win_create(A, NROWS * NCOLS * sizeof(int), sizeof(int), MPI_INFO_NULL, CommDeuce,
75 MPI_Win_fence(0, win);
77 MPI_Win_fence(0, win);
79 for (j = 0; j < NCOLS; j++) {
80 for (i = 0; i < NROWS; i++) {
81 if (A[j][i] != i * NCOLS + j) {
83 printf("Error: A[%d][%d]=%d should be %d\n", j, i,
84 A[j][i], i * NCOLS + j);
91 printf("Total number of errors: %d\n", errs);
97 MPI_Comm_free(&CommDeuce);