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. Use IN_PLACE */
15 int main( int argc, char **argv )
19 int count, minsize = 2;
23 MTest_Init( &argc, &argv );
25 while (MTestGetIntracommGeneral( &comm, minsize, 1 )) {
26 if (comm == MPI_COMM_NULL) continue;
27 /* Determine the sender and receiver */
28 MPI_Comm_rank( comm, &rank );
29 MPI_Comm_size( comm, &size );
31 for (count = 1; count < 9000; count = count * 2) {
32 vecout = (double *)malloc( size * count * sizeof(double) );
34 for (i=0; i<count; i++) {
35 vecout[rank*count+i] = rank*count+i;
37 MPI_Allgather( MPI_IN_PLACE, -1, MPI_DATATYPE_NULL,
38 vecout, count, MPI_DOUBLE, comm );
39 for (i=0; i<count*size; i++) {
43 fprintf( stderr, "vecout[%d]=%d\n",
51 MTestFreeComm( &comm );
54 #if MTEST_HAVE_MIN_MPI_VERSION(2,2)
55 MPI_Comm_set_errhandler(MPI_COMM_WORLD, MPI_ERRORS_RETURN);
56 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
57 MPI_Comm_size(MPI_COMM_WORLD, &size);
58 vecout = (double *) malloc(size * sizeof(double));
59 if (MPI_SUCCESS == MPI_Allgather(&vecout[rank], 1, MPI_DOUBLE,
60 vecout, 1, MPI_DOUBLE, MPI_COMM_WORLD))
65 MTest_Finalize( errs );