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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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