38 lines
958 B
C++
38 lines
958 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 <boost/mpi/collectives.hpp>
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#include <iostream>
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#include <cstdlib>
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#include <vector>
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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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std::vector<int> all;
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int mine = -1;
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if (world.rank() == 0) {
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all.resize(world.size());
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std::generate(all.begin(), all.end(), std::rand);
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}
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mpi::scatter(world, all, mine, 0);
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for (int r = 0; r < world.size(); ++r) {
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world.barrier();
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if (r == world.rank()) {
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std::cout << "Rank " << r << " got " << mine << '\n';
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}
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}
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return 0;
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}
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