premiere-libtorrent/test/test_bandwidth_limiter.cpp

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#include "test.hpp"
#include "libtorrent/bandwidth_manager.hpp"
#include "libtorrent/socket.hpp"
#include "libtorrent/stat.hpp"
#include "libtorrent/time.hpp"
#include <boost/lexical_cast.hpp>
struct torrent;
struct peer_connection;
using namespace libtorrent;
const float sample_time = 6.f; // seconds
//#define VERBOSE_LOGGING
struct torrent
{
torrent(bandwidth_manager<peer_connection, torrent>& m)
: m_bandwidth_manager(m)
{}
void assign_bandwidth(int channel, int amount, int max_block_size)
{
#ifdef VERBOSE_LOGGING
std::cerr << time_now_string()
<< ": assign bandwidth, " << amount << " blk: " << max_block_size << std::endl;
#endif
assert(amount > 0);
assert(amount <= max_block_size);
if (amount < max_block_size)
expire_bandwidth(channel, max_block_size - amount);
}
int bandwidth_throttle(int channel) const
{ return m_bandwidth_limit[channel].throttle(); }
int max_assignable_bandwidth(int channel) const
{ return m_bandwidth_limit[channel].max_assignable(); }
void request_bandwidth(int channel
, boost::intrusive_ptr<peer_connection> const& p
, bool non_prioritized)
{
assert(m_bandwidth_limit[channel].throttle() > 0);
int block_size = m_bandwidth_limit[channel].throttle() / 10;
if (block_size <= 0) block_size = 1;
if (m_bandwidth_limit[channel].max_assignable() > 0)
{
#ifdef VERBOSE_LOGGING
std::cerr << time_now_string()
<< ": request bandwidth " << block_size << std::endl;
#endif
perform_bandwidth_request(channel, p, block_size, non_prioritized);
}
else
{
#ifdef VERBOSE_LOGGING
std::cerr << time_now_string()
<< ": queue bandwidth request" << block_size << std::endl;
#endif
// skip forward in the queue until we find a prioritized peer
// or hit the front of it.
queue_t::reverse_iterator i = m_bandwidth_queue[channel].rbegin();
while (i != m_bandwidth_queue[channel].rend() && i->non_prioritized) ++i;
m_bandwidth_queue[channel].insert(i.base(), bw_queue_entry<peer_connection>(
p, block_size, non_prioritized));
}
}
void expire_bandwidth(int channel, int amount)
{
#ifdef VERBOSE_LOGGING
std::cerr << time_now_string()
<< ": expire bandwidth, " << amount << std::endl;
#endif
assert(amount > 0);
m_bandwidth_limit[channel].expire(amount);
while (!m_bandwidth_queue[channel].empty())
{
bw_queue_entry<peer_connection> qe = m_bandwidth_queue[channel].front();
if (m_bandwidth_limit[channel].max_assignable() == 0)
break;
m_bandwidth_queue[channel].pop_front();
perform_bandwidth_request(channel, qe.peer
, qe.max_block_size, qe.non_prioritized);
}
}
void perform_bandwidth_request(int channel
, boost::intrusive_ptr<peer_connection> const& p
, int block_size
, bool non_prioritized)
{
m_bandwidth_manager.request_bandwidth(p
, block_size, non_prioritized);
m_bandwidth_limit[channel].assign(block_size);
}
bandwidth_limit m_bandwidth_limit[1];
typedef std::deque<bw_queue_entry<peer_connection> > queue_t;
queue_t m_bandwidth_queue[1];
bandwidth_manager<peer_connection, torrent>& m_bandwidth_manager;
};
struct peer_connection
{
peer_connection(io_service& ios, boost::shared_ptr<torrent> const& t
, bool prio, bool ignore_limits, std::string name)
: m_torrent(t)
, m_prioritized(prio)
, m_ignore_limits(ignore_limits)
, m_abort(false)
, m_ios(ios)
, m_name(name)
, m_refs(0)
{}
bool ignore_bandwidth_limits() { return m_ignore_limits; }
int max_assignable_bandwidth(int channel) const
{ return m_bandwidth_limit[channel].max_assignable(); }
boost::weak_ptr<torrent> associated_torrent() const
{ return m_torrent; }
bool is_disconnecting() const { return m_abort; }
void assign_bandwidth(int channel, int amount)
{
#ifdef VERBOSE_LOGGING
std::cerr << time_now_string() << ": [" << m_name
<< "] assign bandwidth, " << amount << std::endl;
#endif
assert(amount > 0);
m_bandwidth_limit[channel].assign(amount);
boost::shared_ptr<torrent> t = m_torrent.lock();
if (!t) return;
m_stats.sent_bytes(amount, 0);
m_ios.post(boost::bind(&torrent::request_bandwidth, t, int(0)
, intrusive_ptr<peer_connection>(this), !m_prioritized));
}
void start()
{
boost::shared_ptr<torrent> t = m_torrent.lock();
if (!t) return;
t->request_bandwidth(0, this, !m_prioritized);
}
void stop() { m_abort = true; }
void expire_bandwidth(int channel, int amount)
{
assert(amount > 0);
#ifdef VERBOSE_LOGGING
std::cerr << time_now_string() << ": [" << m_name
<< "] expire bandwidth, " << amount << std::endl;
#endif
m_bandwidth_limit[channel].expire(amount);
}
void tick()
{
#ifdef VERBOSE_LOGGING
std::cerr << time_now_string() << ": [" << m_name
<< "] tick, rate: " << m_stats.upload_rate() << std::endl;
#endif
m_stats.second_tick(1.f);
}
int bandwidth_throttle(int channel) const
{ return m_bandwidth_limit[channel].throttle(); }
bandwidth_limit m_bandwidth_limit[1];
boost::weak_ptr<torrent> m_torrent;
bool m_prioritized;
bool m_ignore_limits;
bool m_abort;
libtorrent::stat m_stats;
io_service& m_ios;
std::string m_name;
int m_refs;
};
void intrusive_ptr_add_ref(peer_connection* p)
{
++p->m_refs;
}
void intrusive_ptr_release(peer_connection* p)
{
if (--p->m_refs == 0)
delete p;
}
typedef std::vector<boost::intrusive_ptr<peer_connection> > connections_t;
bool abort_tick = false;
void do_tick(asio::error_code const&e, deadline_timer& tick, connections_t& v)
{
if (e || abort_tick)
{
std::cerr << " tick aborted" << std::endl;
return;
}
std::for_each(v.begin(), v.end()
, boost::bind(&peer_connection::tick, _1));
tick.expires_from_now(seconds(1));
tick.async_wait(boost::bind(&do_tick, _1, boost::ref(tick), boost::ref(v)));
}
void do_stop(deadline_timer& tick, connections_t& v)
{
abort_tick = true;
tick.cancel();
std::for_each(v.begin(), v.end()
, boost::bind(&peer_connection::stop, _1));
std::cerr << " stopping..." << std::endl;
}
void run_test(io_service& ios, connections_t& v)
{
abort_tick = false;
std::cerr << "-------------\n" << std::endl;
deadline_timer tick(ios);
tick.expires_from_now(seconds(1));
tick.async_wait(boost::bind(&do_tick, _1, boost::ref(tick), boost::ref(v)));
deadline_timer complete(ios);
complete.expires_from_now(milliseconds(int(sample_time * 1000)));
complete.async_wait(boost::bind(&do_stop, boost::ref(tick), boost::ref(v)));
std::for_each(v.begin(), v.end()
, boost::bind(&peer_connection::start, _1));
ios.run();
}
bool close_to(float val, float comp, float err)
{
return fabs(val - comp) <= err;
}
void spawn_connections(connections_t& v, io_service& ios
, boost::shared_ptr<torrent> t, int num, char const* prefix)
{
for (int i = 0; i < num; ++i)
{
v.push_back(new peer_connection(ios, t, true, false
, prefix + boost::lexical_cast<std::string>(i)));
}
}
void test_equal_connections(int num, int limit)
{
std::cerr << "test equal connections " << num << " " << limit << std::endl;
io_service ios;
bandwidth_manager<peer_connection, torrent> manager(ios, 0);
manager.throttle(limit);
boost::shared_ptr<torrent> t1(new torrent(manager));
connections_t v;
spawn_connections(v, ios, t1, num, "p");
run_test(ios, v);
float sum = 0.f;
2007-07-06 04:38:21 +02:00
float err = (std::max)(limit / num * 0.3f, 1000.f);
for (connections_t::iterator i = v.begin()
, end(v.end()); i != end; ++i)
{
sum += (*i)->m_stats.total_payload_upload();
std::cerr << (*i)->m_stats.total_payload_upload() / sample_time
<< " target: " << (limit / num) << " eps: " << err << std::endl;
TEST_CHECK(close_to((*i)->m_stats.total_payload_upload() / sample_time, limit / num, err));
}
sum /= sample_time;
std::cerr << "sum: " << sum << " target: " << limit << std::endl;
TEST_CHECK(sum > 0);
TEST_CHECK(close_to(sum, limit, 50));
}
void test_single_peer(int limit, bool torrent_limit)
{
std::cerr << "test single peer " << limit << " " << torrent_limit << std::endl;
io_service ios;
bandwidth_manager<peer_connection, torrent> manager(ios, 0);
boost::shared_ptr<torrent> t1(new torrent(manager));
if (torrent_limit)
t1->m_bandwidth_limit[0].throttle(limit);
else
manager.throttle(limit);
connections_t v;
spawn_connections(v, ios, t1, 1, "p");
run_test(ios, v);
float sum = 0.f;
for (connections_t::iterator i = v.begin()
, end(v.end()); i != end; ++i)
{
sum += (*i)->m_stats.total_payload_upload();
}
sum /= sample_time;
std::cerr << sum << " target: " << limit << std::endl;
TEST_CHECK(sum > 0);
TEST_CHECK(close_to(sum, limit, 1000));
}
void test_torrents(int num, int limit1, int limit2, int global_limit)
{
std::cerr << "test equal torrents " << num << " " << limit1 << " " << limit2 << std::endl;
io_service ios;
bandwidth_manager<peer_connection, torrent> manager(ios, 0);
if (global_limit > 0)
manager.throttle(global_limit);
boost::shared_ptr<torrent> t1(new torrent(manager));
boost::shared_ptr<torrent> t2(new torrent(manager));
t1->m_bandwidth_limit[0].throttle(limit1);
t2->m_bandwidth_limit[0].throttle(limit2);
connections_t v1;
spawn_connections(v1, ios, t1, num, "t1p");
connections_t v2;
spawn_connections(v2, ios, t2, num, "t2p");
connections_t v;
std::copy(v1.begin(), v1.end(), std::back_inserter(v));
std::copy(v2.begin(), v2.end(), std::back_inserter(v));
run_test(ios, v);
float sum = 0.f;
for (connections_t::iterator i = v1.begin()
, end(v1.end()); i != end; ++i)
{
sum += (*i)->m_stats.total_payload_upload();
}
sum /= sample_time;
std::cerr << sum << " target: " << limit1 << std::endl;
TEST_CHECK(sum > 0);
TEST_CHECK(close_to(sum, limit1, 1000));
sum = 0.f;
for (connections_t::iterator i = v2.begin()
, end(v2.end()); i != end; ++i)
{
sum += (*i)->m_stats.total_payload_upload();
}
sum /= sample_time;
std::cerr << sum << " target: " << limit2 << std::endl;
TEST_CHECK(sum > 0);
TEST_CHECK(close_to(sum, limit2, 1000));
}
void test_peer_priority(int limit, bool torrent_limit)
{
std::cerr << "test peer priority " << limit << " " << torrent_limit << std::endl;
io_service ios;
bandwidth_manager<peer_connection, torrent> manager(ios, 0);
boost::shared_ptr<torrent> t1(new torrent(manager));
if (torrent_limit)
t1->m_bandwidth_limit[0].throttle(limit);
else
manager.throttle(limit);
connections_t v1;
spawn_connections(v1, ios, t1, 10, "p");
connections_t v;
std::copy(v1.begin(), v1.end(), std::back_inserter(v));
boost::intrusive_ptr<peer_connection> p(
new peer_connection(ios, t1, false, false, "no-priority"));
v.push_back(p);
run_test(ios, v);
float sum = 0.f;
for (connections_t::iterator i = v1.begin()
, end(v1.end()); i != end; ++i)
{
sum += (*i)->m_stats.total_payload_upload();
}
sum /= sample_time;
std::cerr << sum << " target: " << limit << std::endl;
TEST_CHECK(sum > 0);
TEST_CHECK(close_to(sum, limit, 50));
std::cerr << "non-prioritized rate: " << p->m_stats.total_payload_upload() / sample_time << std::endl;
TEST_CHECK(p->m_stats.total_payload_upload() / sample_time < 10);
}
void test_no_starvation(int limit)
{
std::cerr << "test no starvation " << limit << std::endl;
io_service ios;
bandwidth_manager<peer_connection, torrent> manager(ios, 0);
boost::shared_ptr<torrent> t1(new torrent(manager));
boost::shared_ptr<torrent> t2(new torrent(manager));
manager.throttle(limit);
const int num_peers = 20;
connections_t v1;
spawn_connections(v1, ios, t1, num_peers, "p");
connections_t v;
std::copy(v1.begin(), v1.end(), std::back_inserter(v));
boost::intrusive_ptr<peer_connection> p(
new peer_connection(ios, t2, false, false, "no-priority"));
v.push_back(p);
run_test(ios, v);
float sum = 0.f;
for (connections_t::iterator i = v.begin()
, end(v.end()); i != end; ++i)
{
sum += (*i)->m_stats.total_payload_upload();
}
sum /= sample_time;
std::cerr << sum << " target: " << limit << std::endl;
TEST_CHECK(sum > 0);
TEST_CHECK(close_to(sum, limit, 50));
std::cerr << "non-prioritized rate: " << p->m_stats.total_payload_upload() / sample_time << std::endl;
TEST_CHECK(close_to(p->m_stats.total_payload_upload() / sample_time, limit / (num_peers + 1), 1000));
}
int test_main()
{
using namespace libtorrent;
test_equal_connections(2, 20);
test_equal_connections(2, 2000);
test_equal_connections(2, 20000);
test_equal_connections(3, 20000);
test_equal_connections(5, 20000);
test_equal_connections(7, 20000);
test_equal_connections(33, 60000);
test_equal_connections(33, 500000);
test_torrents(2, 400, 400, 0);
test_torrents(2, 100, 500, 0);
test_torrents(2, 3000, 3000, 6000);
test_torrents(1, 40000, 40000, 0);
test_torrents(24, 50000, 50000, 0);
test_single_peer(40000, true);
test_single_peer(40000, false);
test_peer_priority(40000, false);
test_peer_priority(40000, true);
test_no_starvation(40000);
return 0;
}