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improve parallelism of connection_tester gen-torrent (#1805) 

improve parallelism of connection_tester gen-torrent
This commit is contained in:
Arvid Norberg 2017-03-11 19:03:19 -05:00 committed by GitHub
parent 6ab18136f0
commit 94effa6ba7
1 changed files with 20 additions and 15 deletions
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35
examples/connection_tester.cpp
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@ -46,8 +46,8 @@ POSSIBILITY OF SUCH DAMAGE.
#include <thread>
#include <functional>
#include <iostream>
#include <atomic>
#include <array>
#include <boost/detail/atomic_count.hpp>
#if BOOST_ASIO_DYN_LINK
#if BOOST_VERSION >= 104500
@ -89,7 +89,7 @@ bool test_corruption = false;
// number of seeds we've spawned. The test is terminated
// when this reaches zero, for dual tests
static boost::detail::atomic_count num_seeds(0);
std::atomic<int> num_seeds(0);
// the kind of test to run. Upload sends data to a
// bittorrent client, download requests data from
@ -100,10 +100,10 @@ enum test_mode_t{ none, upload_test, download_test, dual_test };
test_mode_t test_mode = none;
// the number of suggest messages received (total across all peers)
boost::detail::atomic_count num_suggest(0);
std::atomic<int> num_suggest(0);
// the number of requests made from suggested pieces
boost::detail::atomic_count num_suggested_requests(0);
std::atomic<int> num_suggested_requests(0);
void sleep_ms(int milliseconds)
{
@ -816,22 +816,27 @@ void generate_torrent(std::vector<char>& buf, int size, int num_files
file_size += 200;
}
// fs.add_file("stress_test_file", total_size);
libtorrent::create_torrent t(fs, piece_size);
// generate the hashes in 4 threads
std::thread t1(&hasher_thread, &t, piece_index_t(0), piece_index_t(1 * num_pieces / 4), piece_size, false);
std::thread t2(&hasher_thread, &t, piece_index_t(1 * num_pieces / 4), piece_index_t(2 * num_pieces / 4), piece_size, false);
std::thread t3(&hasher_thread, &t, piece_index_t(2 * num_pieces / 4), piece_index_t(3 * num_pieces / 4), piece_size, false);
std::thread t4(&hasher_thread, &t, piece_index_t(3 * num_pieces / 4), piece_index_t(4 * num_pieces / 4), piece_size, true);
int const num_threads = std::thread::hardware_concurrency()
? std::thread::hardware_concurrency() : 4;
std::printf("hashing in %d threads\n", num_threads);
t1.join();
t2.join();
t3.join();
t4.join();
std::vector<std::thread> threads;
threads.reserve(num_threads);
for (int i = 0; i < num_threads; ++i)
{
threads.emplace_back(&hasher_thread, &t
, piece_index_t(i * num_pieces / num_threads)
, piece_index_t((i + 1) * num_pieces / num_threads)
, piece_size
, i == 0);
}
for (auto& i : threads)
i.join();
std::back_insert_iterator<std::vector<char>> out(buf);
bencode(out, t.generate());
}