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.
11 int main( int argc, char *argv[] )
14 int size, dims[2], periods[2], remain[2];
16 MPI_Comm comm, newcomm;
18 MTest_Init( &argc, &argv );
20 /* First, create a 1-dim cartesian communicator */
22 MPI_Comm_size( MPI_COMM_WORLD, &size );
24 MPI_Cart_create( MPI_COMM_WORLD, 1, dims, periods, 0, &comm );
26 /* Now, extract a communicator with no dimensions */
28 MPI_Cart_sub( comm, remain, &newcomm );
30 MPI_Comm_rank(comm, &rank);
33 /* This should be congruent to MPI_COMM_SELF */
34 MPI_Comm_compare( MPI_COMM_SELF, newcomm, &result );
35 if (result != MPI_CONGRUENT) {
37 printf( "cart sub to size 0 did not give self\n" );
39 MPI_Comm_free( &newcomm );
41 else if (newcomm != MPI_COMM_NULL) {
43 printf( "cart sub to size 0 did not give null\n" );
46 /* Free the new communicator so that storage leak tests will
48 MPI_Comm_free( &comm );
50 MTest_Finalize( errs );