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