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- // Copyright (C) 2005, 2006 Douglas Gregor.
- // 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 the gather() and gatherv() collectives.
- #include <boost/mpi/collectives/gather.hpp>
- #include <boost/mpi/collectives/gatherv.hpp>
- #include <boost/mpi/communicator.hpp>
- #include <boost/mpi/environment.hpp>
- #include "gps_position.hpp"
- #include <boost/serialization/string.hpp>
- #include <boost/serialization/list.hpp>
- #include <boost/iterator/counting_iterator.hpp>
- #include <boost/lexical_cast.hpp>
- #define BOOST_TEST_MODULE mpi_gather
- #include <boost/test/included/unit_test.hpp>
- using boost::mpi::communicator;
- template<typename Generator>
- void
- gather_test(const communicator& comm, Generator generator,
- const char* kind, int root = -1)
- {
- typedef typename Generator::result_type value_type;
- value_type value = generator(comm.rank());
- if (root == -1) {
- for (root = 0; root < comm.size(); ++root)
- gather_test(comm, generator, kind, root);
- } else {
- using boost::mpi::gather;
- std::vector<value_type> values;
- if (comm.rank() == root) {
- std::cout << "Gathering " << kind << " from root "
- << root << "..." << std::endl;
- }
- gather(comm, value, values, root);
- if (comm.rank() == root) {
- std::vector<value_type> expected_values;
- for (int p = 0; p < comm.size(); ++p)
- expected_values.push_back(generator(p));
- BOOST_CHECK(values == expected_values);
- } else {
- BOOST_CHECK(values.empty());
- }
- }
- (comm.barrier)();
- }
- template<typename Generator>
- void
- gatherv_test(const communicator& comm, Generator generator,
- const char* kind, int root = -1)
- {
- typedef typename Generator::result_type value_type;
- if (root == -1) {
- for (root = 0; root < comm.size(); ++root)
- gatherv_test(comm, generator, kind, root);
- } else {
- using boost::mpi::gatherv;
- int mysize = comm.rank() + 1;
- int nprocs = comm.size();
- // process p will send p+1 identical generator(p) elements
- std::vector<value_type> myvalues(mysize, generator(comm.rank()));
- if (comm.rank() == root) {
- std::vector<value_type> values((nprocs*(nprocs+1))/2);
- std::vector<int> sizes(comm.size());
- for (int p = 0; p < comm.size(); ++p)
- sizes[p] = p + 1;
- std::cout << "Gatheringv " << kind << " from root "
- << root << "..." << std::endl;
- gatherv(comm, myvalues, &values[0], sizes, root);
- std::vector<value_type> expected_values;
- for (int p = 0; p < comm.size(); ++p)
- for (int i = 0; i < p+1; ++i)
- expected_values.push_back(generator(p));
- BOOST_CHECK(values == expected_values);
- } else {
- gatherv(comm, myvalues, root);
- }
- }
- (comm.barrier)();
- }
- //
- // Generators to test with gather/gatherv
- //
- struct int_generator
- {
- typedef int result_type;
- int operator()(int p) const { return 17 + p; }
- };
- struct gps_generator
- {
- typedef gps_position result_type;
- gps_position operator()(int p) const
- {
- return gps_position(39 + p, 16, 20.2799);
- }
- };
- struct string_generator
- {
- typedef std::string result_type;
- std::string operator()(int p) const
- {
- std::string result = boost::lexical_cast<std::string>(p);
- result += " rosebud";
- if (p != 1) result += 's';
- return result;
- }
- };
- struct string_list_generator
- {
- typedef std::list<std::string> result_type;
- std::list<std::string> operator()(int p) const
- {
- std::list<std::string> result;
- for (int i = 0; i <= p; ++i) {
- std::string value = boost::lexical_cast<std::string>(i);
- result.push_back(value);
- }
- return result;
- }
- };
- BOOST_AUTO_TEST_CASE(gather_check)
- {
- boost::mpi::environment env;
- communicator comm;
- gather_test(comm, int_generator(), "integers");
- gather_test(comm, gps_generator(), "GPS positions");
- gather_test(comm, string_generator(), "string");
- gather_test(comm, string_list_generator(), "list of strings");
- gatherv_test(comm, int_generator(), "integers");
- gatherv_test(comm, gps_generator(), "GPS positions");
- gatherv_test(comm, string_generator(), "string");
- gatherv_test(comm, string_list_generator(), "list of strings");
- }
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