1 /* -*- Mode: C; c-basic-offset:4 ; -*- */
3 * (C) 2001 by Argonne National Laboratory.
4 * See COPYRIGHT in top-level directory.
13 This program tests MPI_Alltoallv by having processor i send different
14 amounts of data to each processor.
16 Because there are separate send and receive types to alltoallv,
17 there need to be tests to rearrange data on the fly. Not done yet.
19 The first test sends i items to processor i from all processors.
21 Currently, the test uses only MPI_INT; this is adequate for testing systems
22 that use point-to-point operations
28 * <0> sbuf: (#9): [0][1][2][3][4][5][6][7][8]
29 <0> scount: (#3): [0][1][2]
30 <0> rcount: (#3): [0][0][0]
31 <0> sdisp: (#3): [0][1][3]
32 <0> rdisp: (#3): [0][0][0]
34 <1> sbuf: (#9): [100][101][102][103][104][105][106][107][108]
35 <1> scount: (#3): [0][1][2]
36 <1> rcount: (#3): [1][1][1]
37 <1> sdisp: (#3): [0][1][3]
38 <1> rdisp: (#3): [0][1][2]
40 <2> sbuf: (#9): [200][201][202][203][204][205][206][207][208]
41 <2> scount: (#3): [0][1][2]
42 <2> rcount: (#3): [2][2][2]
43 <2> sdisp: (#3): [0][1][3]
44 <2> rdisp: (#3): [0][2][4]
47 <0> rbuf: (#9): [-1][-1][-1][-1][-1][-1][-1][-1][-1]
48 <1> rbuf: (#9): [1][101][201][-1][-1][-1][-1][-1][-1]
49 <2> rbuf: (#9): [3][4][103][104][203][204][-1][-1][-1]
53 static void print_buffer_int(void *buf, int len, char *msg, int rank)
56 printf("[%d] %s (#%d): ", rank, msg, len);
57 for (tmp = 0; tmp < len; tmp++) {
59 printf("[%d]", v[tmp]);
66 int main(int argc, char **argv)
72 int *sendcounts, *recvcounts, *rdispls, *sdispls;
75 MPI_Init(&argc, &argv);
77 comm = MPI_COMM_WORLD;
79 /* Create the buffer */
80 MPI_Comm_size(comm, &size);
81 MPI_Comm_rank(comm, &rank);
82 sbuf = (int *) xbt_malloc(size * size * sizeof(int));
83 rbuf = (int *) xbt_malloc(size * size * sizeof(int));
85 /* Load up the buffers */
86 for (i = 0; i < size * size; i++) {
87 sbuf[i] = i + 100 * rank;
91 /* Create and load the arguments to alltoallv */
92 sendcounts = (int *) xbt_malloc(size * sizeof(int));
93 recvcounts = (int *) xbt_malloc(size * sizeof(int));
94 rdispls = (int *) xbt_malloc(size * sizeof(int));
95 sdispls = (int *) xbt_malloc(size * sizeof(int));
96 for (i = 0; i < size; i++) {
99 rdispls[i] = i * rank;
100 sdispls[i] = (i * (i + 1)) / 2;
103 print_buffer_int( sbuf, size*size, strdup("sbuf:"),rank);
104 print_buffer_int( sendcounts, size, strdup("scount:"),rank);
105 print_buffer_int( recvcounts, size, strdup("rcount:"),rank);
106 print_buffer_int( sdispls, size, strdup("sdisp:"),rank);
107 print_buffer_int( rdispls, size, strdup("rdisp:"),rank);
109 MPI_Alltoallv(sbuf, sendcounts, sdispls, MPI_INT,
110 rbuf, recvcounts, rdispls, MPI_INT, comm);
112 print_buffer_int( rbuf, size*size, strdup("rbuf:"),rank);
114 MPI_Barrier(MPI_COMM_WORLD);
116 printf("Alltoallv TEST COMPLETE.\n");