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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 scatter() and scatterv() collectives.
#include <iterator>
#include <boost/mpi/collectives/scatter.hpp>
#include <boost/mpi/collectives/scatterv.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>
#include "mpi_test_utils.hpp"
using namespace boost::mpi;
template<typename Generator>
int
scatter_test(const communicator& comm, Generator generator,
const char* kind, int root = -1)
{
typedef typename Generator::result_type value_type;
int failed = 0;
if (root == -1) {
for (root = 0; root < comm.size(); ++root)
scatter_test(comm, generator, kind, root);
} else {
using boost::mpi::scatter;
value_type value;
if (comm.rank() == root) {
std::vector<value_type> values;
for (int p = 0; p < comm.size(); ++p)
values.push_back(generator(p));
std::cout << "Scattering " << kind << " from root "
<< root << "..." << std::endl;
scatter(comm, values, value, root);
} else {
scatter(comm, value, root);
}
BOOST_MPI_CHECK(value == generator(comm.rank()), failed);
}
comm.barrier();
return failed;
}
//
// Generators to test with scatter/scatterv
//
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;
}
};
std::ostream&
operator<<(std::ostream& out, std::list<std::string> const& l) {
out << '[';
std::copy(l.begin(), l.end(), std::ostream_iterator<std::string>(out, " "));
out << ']';
return out;
}
template<typename Generator>
int
scatterv_test(const communicator& comm, Generator generator,
const char* kind, int root = -1)
{
typedef typename Generator::result_type value_type;
int failed = 0;
if (root == -1) {
for (root = 0; root < comm.size(); ++root)
scatterv_test(comm, generator, kind, root);
} else {
using boost::mpi::scatterv;
int mysize = comm.rank() + 1;
std::vector<value_type> myvalues(mysize);
if (comm.rank() == root) {
std::vector<value_type> values;
std::vector<int> sizes(comm.size());
// process p will receive p+1 identical generator(p) elements
for (int p = 0; p < comm.size(); ++p) {
for (int i = 0; i < p+1; ++i)
values.push_back(generator(p));
sizes[p] = p + 1;
}
std::cout << "Scatteringv " << kind << " from root "
<< root << "..." << std::endl;
assert(mysize == sizes[comm.rank()]);
scatterv(comm, values, sizes, &(myvalues[0]), root);
} else {
scatterv(comm, &(myvalues[0]), mysize, root);
}
for (int i = 0; i < mysize; ++i)
BOOST_MPI_CHECK(myvalues[i] == generator(comm.rank()), failed);
}
comm.barrier();
return failed;
}
template<typename Generator>
int
scatterd_test(const communicator& comm, Generator generator,
const char* kind, int root = -1)
{
typedef typename Generator::result_type value_type;
int failed = 0;
if (root == -1) {
for (root = 0; root < comm.size(); ++root)
scatterv_test(comm, generator, kind, root);
} else {
using boost::mpi::scatterv;
int mysize = comm.rank() + 1;
std::vector<value_type> myvalues(mysize);
if (comm.rank() == root) {
std::vector<value_type> values;
std::vector<int> sizes(comm.size());
std::vector<int> displs(comm.size());
value_type noise = generator(comm.size()+1);
// process p will receive a payload of p+1 identical generator(p) elements
// root will insert pseudo random pading between each payload.
int shift = 0; // the current position of next payload in source array
for (int p = 0; p < comm.size(); ++p) {
int size = p+1;
int pad = p % 3;
// padding
for (int i = 0; i < pad; ++i) {
values.push_back(noise);
}
// payload
for (int i = 0; i < size; ++i)
values.push_back(generator(p));
shift += pad;
displs[p] = shift;
sizes[p] = size;
shift += size;
}
std::cout << "Scatteringv " << kind << " from root "
<< root << "..." << std::endl;
assert(mysize == sizes[comm.rank()]);
scatterv(comm, values, sizes, displs, &(myvalues[0]), mysize, root);
} else {
scatterv(comm, &(myvalues[0]), mysize, root);
}
for (int i = 0; i < mysize; ++i)
BOOST_MPI_CHECK(myvalues[i] == generator(comm.rank()), failed);
}
comm.barrier();
return failed;
}
int main()
{
environment env;
communicator comm;
int failed = 0;
BOOST_MPI_COUNT_FAILED(scatter_test(comm, int_generator(), "integers"), failed);
BOOST_MPI_COUNT_FAILED(scatter_test(comm, gps_generator(), "GPS positions"), failed);
BOOST_MPI_COUNT_FAILED(scatter_test(comm, string_generator(), "string"), failed);
BOOST_MPI_COUNT_FAILED(scatter_test(comm, string_list_generator(), "list of strings"), failed);
BOOST_MPI_COUNT_FAILED(scatterv_test(comm, int_generator(), "integers"), failed);
BOOST_MPI_COUNT_FAILED(scatterv_test(comm, gps_generator(), "GPS positions"), failed);
BOOST_MPI_COUNT_FAILED(scatterv_test(comm, string_generator(), "string"), failed);
BOOST_MPI_COUNT_FAILED(scatterv_test(comm, string_list_generator(), "list of strings"), failed);
BOOST_MPI_COUNT_FAILED(scatterd_test(comm, int_generator(), "integers"), failed);
BOOST_MPI_COUNT_FAILED(scatterd_test(comm, gps_generator(), "GPS positions"), failed);
BOOST_MPI_COUNT_FAILED(scatterd_test(comm, string_generator(), "string"), failed);
BOOST_MPI_COUNT_FAILED(scatterd_test(comm, string_list_generator(), "list of strings"), failed);
return failed;
}
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