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/*
* Copyright © 2013 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Thomas Voß <thomas.voss@canonical.com>
*/
#include "benchmark_service.h"
#include <core/dbus/announcer.h>
#include <core/dbus/resolver.h>
#include <core/dbus/asio/executor.h>
#include <core/dbus/types/stl/vector.h>
#include <boost/accumulators/accumulators.hpp>
#include <boost/accumulators/statistics/stats.hpp>
#include <boost/accumulators/statistics/mean.hpp>
#include <boost/accumulators/statistics/moment.hpp>
#include <boost/accumulators/statistics/variance.hpp>
#include <cstdio>
#include <fstream>
#include <sys/types.h>
#include <signal.h>
#include <unistd.h>
namespace acc = boost::accumulators;
namespace dbus = core::dbus;
namespace
{
dbus::Bus::Ptr the_session_bus()
{
dbus::Bus::Ptr session_bus = std::make_shared<dbus::Bus>(dbus::WellKnownBus::session);
return session_bus;
}
struct CrossProcessSync
{
static const int read_fd = 0;
static const int write_fd = 1;
CrossProcessSync()
{
if (pipe(fds) < 0)
throw std::runtime_error(strerror(errno));
}
~CrossProcessSync() noexcept
{
::close(fds[0]);
::close(fds[1]);
}
void signal_ready()
{
int value = 42;
if (!write(fds[write_fd], std::addressof(value), sizeof(value)))
throw std::runtime_error(::strerror(errno));
}
void wait_for_signal_ready()
{
int value;
if (!read(fds[read_fd], std::addressof(value), sizeof(value)))
throw std::runtime_error(::strerror(errno));
}
int fds[2];
};
bool is_child(pid_t pid)
{
return pid == 0;
}
int fork_and_run(int argc, char** argv, std::function<int(int, char**)> child, std::function<int(int, char**, pid_t)> parent)
{
auto pid = fork();
if (pid < 0)
{
throw std::runtime_error(std::string("Could not fork child: ") + std::strerror(errno));
}
try
{
if (is_child(pid))
{
return child(argc, argv);
}
return parent(argc, argv, pid);
}
catch (...)
{
kill(pid, SIGKILL);
}
return EXIT_FAILURE;
}
}
int main(int argc, char** argv)
{
CrossProcessSync cross_process_sync;
auto server = [&cross_process_sync](int, char**)
{
auto bus = the_session_bus();
bus->install_executor(core::dbus::asio::make_executor(bus));
std::thread t1
{
[&]()
{
bus->run();
}
};
test::BenchmarkService::Ptr benchmark_service = dbus::announce_service_on_bus<test::IBenchmarkService, test::BenchmarkService>(bus);
cross_process_sync.signal_ready();
if (t1.joinable())
t1.join();
return EXIT_SUCCESS;
};
auto client = [&cross_process_sync](int, char**, pid_t pid)
{
auto bus = the_session_bus();
cross_process_sync.wait_for_signal_ready();
auto stub = dbus::resolve_service_on_bus<test::IBenchmarkService, test::BenchmarkServiceStub>(bus);
std::ofstream out("dbus_benchmark_int64_t.txt");
acc::accumulator_set<double, acc::stats<acc::tag::mean, acc::tag::lazy_variance > > as;
std::chrono::high_resolution_clock::time_point before;
const int32_t default_value = 42;
const unsigned int iteration_count = 10000;
for (unsigned int i = 0; i < iteration_count; i++)
{
before = std::chrono::high_resolution_clock::now();
auto value = stub->method_int64(default_value);
if (value != default_value)
return EXIT_FAILURE;
auto duration = std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::high_resolution_clock::now() - before);
out << duration.count() << std::endl;
as(duration.count());
}
std::cout << "MethodInt64 -> Mean: " << acc::mean(as) << " [µs], std. dev.: " << std::sqrt(acc::lazy_variance(as)) << " [µs]" << std::endl;
out.close();
out.open("dbus_benchmark_vector_int32_t.txt");
as = acc::accumulator_set<double, acc::stats<acc::tag::mean, acc::tag::lazy_variance > >();
const size_t element_count = 100;
std::vector<int32_t> value(element_count, default_value);
for (unsigned int i = 0; i < iteration_count; i++)
{
before = std::chrono::high_resolution_clock::now();
stub->method_vector_int32(value);
auto duration = std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::high_resolution_clock::now() - before);
out << duration.count() << std::endl;
as(duration.count());
}
std::cout << "MethodVectorInt32 -> Mean: " << acc::mean(as) << " [µs], std. dev.: " << std::sqrt(acc::lazy_variance(as)) << " [µs]" << std::endl;
kill(pid, SIGKILL);
return EXIT_SUCCESS;
};
return fork_and_run(argc, argv, server, client);
}
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