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- // Copyright (C) 2013 Andreas Hehn <hehn@phys.ethz.ch>, ETH Zurich
- // 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 test of communicators created from groups.
- #include <boost/mpi/environment.hpp>
- #include <boost/mpi/communicator.hpp>
- #include <boost/mpi/group.hpp>
- #include <vector>
- #include <algorithm>
- #define BOOST_TEST_MODULE mpi_group_test
- #include <boost/test/included/unit_test.hpp>
- namespace mpi = boost::mpi;
- template <typename T>
- struct iota
- {
- iota() : state(0){};
- T operator()()
- {
- return state++;
- }
- T state;
- };
- void group_test(const mpi::communicator& comm)
- {
- std::vector<int> grp_a_ranks(comm.size() / 2);
- std::generate(grp_a_ranks.begin(),grp_a_ranks.end(),iota<int>());
- mpi::group grp_a = comm.group().include(grp_a_ranks.begin(),grp_a_ranks.end());
- mpi::group grp_b = comm.group().exclude(grp_a_ranks.begin(),grp_a_ranks.end());
- mpi::communicator part_a(comm,grp_a);
- mpi::communicator part_b(comm,grp_b);
- if(part_a)
- {
- std::cout << "comm rank: " << comm.rank() << " -> part_a rank:" << part_a.rank() << std::endl;
- BOOST_CHECK(part_a.rank() == comm.rank());
- }
- if(part_b)
- {
- std::cout << "comm rank: " << comm.rank() << " -> part_b rank:" << part_b.rank() << std::endl;
- BOOST_CHECK(part_b.rank() == comm.rank() - comm.size()/2);
- }
- }
- BOOST_AUTO_TEST_CASE(group)
- {
- mpi::environment env;
- mpi::communicator comm;
- group_test(comm);
- }
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