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
7 // An example using Boost.MPI's gather(): [main]
8
9 #include <boost/mpi.hpp>
10 #include <iostream>
11 #include <cstdlib>
12 namespace mpi = boost::mpi;
13
main(int argc,char * argv[])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 }
30 return 0;
31 }
32