1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
4 * (C) 2003 by Argonne National Laboratory.
5 * See COPYRIGHT in top-level directory.
13 /* Gather data from a vector to contiguous. This is
14 the trivial version based on the allgather test (allgatherv but with
15 constant data sizes) */
17 int main( int argc, char **argv )
19 double *vecout, *invec;
21 int count, minsize = 2;
24 int *displs, *recvcounts;
26 MTest_Init( &argc, &argv );
28 while (MTestGetIntracommGeneral( &comm, minsize, 1 )) {
29 if (comm == MPI_COMM_NULL) continue;
30 /* Determine the sender and receiver */
31 MPI_Comm_rank( comm, &rank );
32 MPI_Comm_size( comm, &size );
34 displs = (int *)malloc( size * sizeof(int) );
35 recvcounts = (int *)malloc( size * sizeof(int) );
37 for (count = 1; count < 9000; count = count * 2) {
38 invec = (double *)malloc( count * sizeof(double) );
39 vecout = (double *)malloc( size * count * sizeof(double) );
41 for (i=0; i<count; i++) {
42 invec[i] = rank*count+i;
44 for (i=0; i<size; i++) {
45 recvcounts[i] = count;
46 displs[i] = i * count;
48 MPI_Allgatherv( invec, count, MPI_DOUBLE,
49 vecout, recvcounts, displs, MPI_DOUBLE, comm );
50 for (i=0; i<count*size; i++) {
54 fprintf( stderr, "vecout[%d]=%d\n",
64 MTestFreeComm( &comm );
67 MTest_Finalize( errs );