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// Copyright (C) 2006 Douglas Gregor <doug.gregor@gmail.com>
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// An example using Boost.MPI's reduce() to compute a minimum value.
#include <boost/mpi.hpp>
#include <iostream>
#include <cstdlib>
namespace mpi = boost::mpi;
int main(int argc, char* argv[])
{
mpi::environment env(argc, argv);
mpi::communicator world;
std::srand(time(0) + world.rank());
int my_number = std::rand();
if (world.rank() == 0) {
int minimum;
reduce(world, my_number, minimum, mpi::minimum<int>(), 0);
std::cout << "The minimum value is " << minimum << std::endl;
} else {
reduce(world, my_number, mpi::minimum<int>(), 0);
}
return 0;
}
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