60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
// Copyright (C) 2013 Andreas Hehn <hehn@phys.ethz.ch>, ETH Zurich
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// A test of communicators created from groups.
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#include <boost/mpi/environment.hpp>
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#include <boost/mpi/communicator.hpp>
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#include <boost/mpi/group.hpp>
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#include <vector>
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#include <algorithm>
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#define BOOST_TEST_MODULE mpi_group_test
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#include <boost/test/included/unit_test.hpp>
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namespace mpi = boost::mpi;
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template <typename T>
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struct iota
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{
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iota() : state(0){};
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T operator()()
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{
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return state++;
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}
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T state;
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};
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void group_test(const mpi::communicator& comm)
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{
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std::vector<int> grp_a_ranks(comm.size() / 2);
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std::generate(grp_a_ranks.begin(),grp_a_ranks.end(),iota<int>());
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mpi::group grp_a = comm.group().include(grp_a_ranks.begin(),grp_a_ranks.end());
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mpi::group grp_b = comm.group().exclude(grp_a_ranks.begin(),grp_a_ranks.end());
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mpi::communicator part_a(comm,grp_a);
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mpi::communicator part_b(comm,grp_b);
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if(part_a)
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{
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std::cout << "comm rank: " << comm.rank() << " -> part_a rank:" << part_a.rank() << std::endl;
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BOOST_CHECK(part_a.rank() == comm.rank());
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}
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if(part_b)
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{
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std::cout << "comm rank: " << comm.rank() << " -> part_b rank:" << part_b.rank() << std::endl;
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BOOST_CHECK(part_b.rank() == comm.rank() - comm.size()/2);
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}
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}
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BOOST_AUTO_TEST_CASE(group)
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{
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mpi::environment env;
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mpi::communicator comm;
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group_test(comm);
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}
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