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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include "mpitest.h"
/*
* This test ensures that shrink works correctly
*/
int main(int argc, char **argv)
{
int rank, size, newsize, rc, errclass, errs = 0;
MPI_Comm newcomm;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Comm_set_errhandler(MPI_COMM_WORLD, MPI_ERRORS_RETURN);
if (size < 4) {
fprintf(stderr, "Must run with at least 4 processes\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
if (2 == rank)
exit(EXIT_FAILURE);
rc = MPIX_Comm_shrink(MPI_COMM_WORLD, &newcomm);
if (rc) {
MPI_Error_class(rc, &errclass);
fprintf(stderr, "Expected MPI_SUCCESS from MPIX_Comm_shrink. Received: %d\n", errclass);
errs++;
MPI_Abort(MPI_COMM_WORLD, 1);
}
MPI_Comm_size(newcomm, &newsize);
if (newsize != size - 1)
errs++;
rc = MPI_Barrier(newcomm);
if (rc) {
MPI_Error_class(rc, &errclass);
fprintf(stderr, "Expected MPI_SUCCESS from MPI_BARRIER. Received: %d\n", errclass);
errs++;
MPI_Abort(MPI_COMM_WORLD, 1);
}
MPI_Comm_free(&newcomm);
if (0 == rank)
fprintf(stdout, " No Errors\n");
MPI_Finalize();
return MTestReturnValue(errs);
}
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