30 lines
818 B
C++
30 lines
818 B
C++
// Copyright (C) 2013 Alain Miniussi <alain.miniussi@oca.eu>
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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 all_reduce() that compute the minimum
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// of each process's value and broadcast the result to all the processes.
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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(world.rank());
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int my_number = std::rand();
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all_reduce(world, my_number, mpi::minimum<int>());
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if (world.rank() == 0) {
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std::cout << "The minimum value is " << my_number << std::endl;
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}
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return 0;
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}
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