| // Copyright (C) 2006 Douglas Gregor <doug.gregor@gmail.com> |
| |
| // Use, modification and distribution is subject to the Boost Software |
| // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| |
| // A simple Hello, world! example using Boost.MPI message passing. |
| |
| #include <boost/mpi.hpp> |
| #include <iostream> |
| #include <boost/serialization/string.hpp> // Needed to send/receive strings! |
| namespace mpi = boost::mpi; |
| |
| int main(int argc, char* argv[]) |
| { |
| mpi::environment env(argc, argv); |
| mpi::communicator world; |
| |
| if (world.rank() == 0) { |
| mpi::request reqs[2]; |
| std::string msg, out_msg = "Hello"; |
| reqs[0] = world.isend(1, 0, out_msg); |
| reqs[1] = world.irecv(1, 1, msg); |
| mpi::wait_all(reqs, reqs + 2); |
| std::cout << msg << "!" << std::endl; |
| } else { |
| mpi::request reqs[2]; |
| std::string msg, out_msg = "world"; |
| reqs[0] = world.isend(0, 1, out_msg); |
| reqs[1] = world.irecv(0, 0, msg); |
| mpi::wait_all(reqs, reqs + 2); |
| std::cout << msg << ", "; |
| } |
| |
| return 0; |
| } |