32 lines
890 B
C++
32 lines
890 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 gather(): [main]
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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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std::vector<int> all_numbers;
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gather(world, my_number, all_numbers, 0);
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for (int proc = 0; proc < world.size(); ++proc)
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std::cout << "Process #" << proc << " thought of " << all_numbers[proc]
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<< std::endl;
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} else {
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gather(world, my_number, 0);
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}
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return 0;
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}
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