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);
41 for (i=0; i<NROWS; i++)
42 for (j=0; j<NCOLS; j++)
43 A[i][j] = i*NCOLS + j;
45 /* create datatype for one column */
46 MPI_Type_vector(NROWS, 1, NCOLS, MPI_INT, &column);
48 /* create datatype for one column, with the extent of one
49 integer. we could use type_create_resized instead. */
51 disp[1] = sizeof(int);
56 MPI_Type_struct(2, blocklen, disp, type, &column1);
57 MPI_Type_commit(&column1);
59 MPI_Win_create(NULL, 0, 1, MPI_INFO_NULL, CommDeuce, &win);
61 MPI_Win_fence(0, win);
63 MPI_Put(A, NROWS*NCOLS, MPI_INT, 1, 0, NCOLS, column1, win);
65 MPI_Type_free(&column);
66 MPI_Type_free(&column1);
68 MPI_Win_fence(0, win);
72 for (i=0; i<NROWS; i++)
73 for (j=0; j<NCOLS; j++)
75 MPI_Win_create(A, NROWS*NCOLS*sizeof(int), sizeof(int), MPI_INFO_NULL, CommDeuce, &win);
76 MPI_Win_fence(0, win);
78 MPI_Win_fence(0, win);
80 for (j=0; j<NCOLS; j++)
82 for (i=0; i<NROWS; i++)
84 if (A[j][i] != i*NCOLS + j)
88 printf("Error: A[%d][%d]=%d should be %d\n", j, i,
89 A[j][i], i*NCOLS + j);
97 printf("Total number of errors: %d\n", errs);
103 MPI_Comm_free(&CommDeuce);
104 MTest_Finalize(errs);