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// Copyright (C) 2005-2006 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 test of the all_gather() collective.
#include <algorithm>
#include <boost/mpi/collectives/all_gather.hpp>
#include <boost/mpi/collectives/all_gatherv.hpp>
#include <boost/mpi/environment.hpp>
#include <boost/mpi/communicator.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_all_gather
#include <boost/test/included/unit_test.hpp>
#include "gps_position.hpp"
namespace mpi = boost::mpi;
template<typename Generator>
void
all_gather_test(const mpi::communicator& comm, Generator generator,
std::string kind)
{
typedef typename Generator::result_type value_type;
value_type value = generator(comm.rank());
std::vector<value_type> values;
if (comm.rank() == 0) {
std::cout << "Gathering " << kind << "...";
std::cout.flush();
}
mpi::all_gather(comm, value, values);
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);
if (comm.rank() == 0 && values == expected_values)
std::cout << "OK." << std::endl;
(comm.barrier)();
}
template<typename Generator>
void
all_gatherv_test(const mpi::communicator& comm, Generator generator,
std::string kind)
{
typedef typename Generator::result_type value_type;
using boost::mpi::all_gatherv;
std::vector<value_type> myvalues, expected, values;
std::vector<int> sizes;
for(int r = 0; r < comm.size(); ++r) {
value_type value = generator(r);
sizes.push_back(r+1);
for (int k=0; k < r+1; ++k) {
expected.push_back(value);
if(comm.rank() == r) {
myvalues.push_back(value);
}
}
}
if (comm.rank() == 0) {
std::cout << "Gathering " << kind << "...";
std::cout.flush();
}
mpi::all_gatherv(comm, myvalues, values, sizes);
BOOST_CHECK(values == expected);
if (comm.rank() == 0 && values == expected)
std::cout << "OK." << std::endl;
(comm.barrier)();
}
// Generates integers to test with gather()
struct int_generator
{
typedef int result_type;
int operator()(int p) const { return 17 + p; }
};
// Generates GPS positions to test with gather()
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(all_gather)
{
boost::mpi::environment env;
mpi::communicator comm;
all_gather_test(comm, int_generator(), "integers");
all_gather_test(comm, gps_generator(), "GPS positions");
all_gather_test(comm, string_generator(), "string");
all_gather_test(comm, string_list_generator(), "list of strings");
all_gatherv_test(comm, int_generator(), "integers");
all_gatherv_test(comm, gps_generator(), "GPS positions");
all_gatherv_test(comm, string_generator(), "string");
all_gatherv_test(comm, string_list_generator(), "list of strings");
}
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