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git.proxmox.com Git - ceph.git/blob - ceph/src/boost/libs/mpi/example/random_gather.cpp
1 // Copyright (C) 2006 Douglas Gregor <doug.gregor@gmail.com>
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)
7 // An example using Boost.MPI's gather(): [main]
9 #include <boost/mpi.hpp>
12 namespace mpi
= boost::mpi
;
14 int main(int argc
, char* argv
[])
16 mpi::environment
env(argc
, argv
);
17 mpi::communicator world
;
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
]
28 gather(world
, my_number
, 0);