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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* (C) 2003 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include "mpi.h"
#include <stdio.h>
#include "mpitest.h"
int main(int argc, char *argv[])
{
int errs = 0;
int size, dims[2], periods[2], remain[2];
int result, rank;
MPI_Comm comm, newcomm;
MTest_Init(&argc, &argv);
/* First, create a 1-dim cartesian communicator */
periods[0] = 0;
MPI_Comm_size(MPI_COMM_WORLD, &size);
dims[0] = size;
MPI_Cart_create(MPI_COMM_WORLD, 1, dims, periods, 0, &comm);
/* Now, extract a communicator with no dimensions */
remain[0] = 0;
MPI_Cart_sub(comm, remain, &newcomm);
MPI_Comm_rank(comm, &rank);
if (rank == 0) {
/* This should be congruent to MPI_COMM_SELF */
MPI_Comm_compare(MPI_COMM_SELF, newcomm, &result);
if (result != MPI_CONGRUENT) {
errs++;
printf("cart sub to size 0 did not give self\n");
}
MPI_Comm_free(&newcomm);
} else if (newcomm != MPI_COMM_NULL) {
errs++;
printf("cart sub to size 0 did not give null\n");
}
/* Free the new communicator so that storage leak tests will
* be happy */
MPI_Comm_free(&comm);
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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