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1 | // Copyright (C) 2006 Douglas Gregor <doug.gregor@gmail.com> |
2 | ||
3 | // Use, modification and distribution is subject to the Boost Software | |
4 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt) | |
6 | ||
11fdf7f2 | 7 | // An example using Boost.MPI's gather(): [main] |
7c673cae FG |
8 | |
9 | #include <boost/mpi.hpp> | |
10 | #include <iostream> | |
11 | #include <cstdlib> | |
12 | namespace mpi = boost::mpi; | |
13 | ||
14 | int main(int argc, char* argv[]) | |
15 | { | |
16 | mpi::environment env(argc, argv); | |
17 | mpi::communicator world; | |
18 | ||
19 | std::srand(time(0) + world.rank()); | |
20 | int my_number = std::rand(); | |
21 | if (world.rank() == 0) { | |
22 | std::vector<int> all_numbers; | |
23 | gather(world, my_number, all_numbers, 0); | |
24 | for (int proc = 0; proc < world.size(); ++proc) | |
25 | std::cout << "Process #" << proc << " thought of " << all_numbers[proc] | |
26 | << std::endl; | |
27 | } else { | |
28 | gather(world, my_number, 0); | |
29 | } | |
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30 | return 0; |
31 | } |