h2load: Refactor statistics hanlding to scale more upcoming new metrics
This commit is contained in:
Tatsuhiro Tsujikawa
parent
fa082cbdd0
commit
cc46d363c5
257
src/h2load.cc
257
src/h2load.cc
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@ -526,7 +526,7 @@ int Client::read_clear() {
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if (!first_byte_received) {
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first_byte_received = true;
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record_time_to_first_byte(&worker->stats);
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record_ttfb(&worker->stats);
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}
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}
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@ -653,7 +653,7 @@ int Client::read_tls() {
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if (!first_byte_received) {
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first_byte_received = true;
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record_time_to_first_byte(&worker->stats);
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record_ttfb(&worker->stats);
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}
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}
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}
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@ -713,8 +713,8 @@ void Client::record_connect_time(Stats *stat) {
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stat->connect_times.push_back(std::chrono::steady_clock::now());
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}
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void Client::record_time_to_first_byte(Stats *stat) {
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stat->time_to_first_bytes.push_back(std::chrono::steady_clock::now());
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void Client::record_ttfb(Stats *stat) {
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stat->ttfbs.push_back(std::chrono::steady_clock::now());
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}
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void Client::signal_write() { ev_io_start(worker->loop, &wev); }
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@ -757,157 +757,99 @@ void Worker::run() {
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}
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namespace {
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double within_sd(const std::vector<std::unique_ptr<Worker>> &workers,
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const std::chrono::microseconds &mean,
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const std::chrono::microseconds &sd, size_t n,
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TimeStatType type) {
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auto upper = mean.count() + sd.count();
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auto lower = mean.count() - sd.count();
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size_t m = 0;
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for (const auto &w : workers) {
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if (type == STAT_REQUEST) {
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for (const auto &req_stat : w->stats.req_stats) {
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if (!req_stat.completed) {
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continue;
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// Returns percentage of number of samples within mean +/- sd.
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template <typename Duration>
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double within_sd(const std::vector<Duration> &samples, const Duration &mean,
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const Duration &sd) {
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if (samples.size() == 0) {
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return 0.0;
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}
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auto t = std::chrono::duration_cast<std::chrono::microseconds>(
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req_stat.stream_close_time - req_stat.request_time);
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if (lower <= t.count() && t.count() <= upper) {
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++m;
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auto lower = mean - sd;
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auto upper = mean + sd;
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auto m = std::count_if(
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std::begin(samples), std::end(samples),
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[&lower, &upper](const Duration &t) { return lower <= t && t <= upper; });
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return (m / static_cast<double>(samples.size())) * 100;
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}
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} // namespace
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namespace {
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// Computes statistics using |samples|. The min, max, mean, sd, and
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// percentage of number of samples within mean +/- sd are computed.
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template <typename Duration>
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TimeStat<Duration> compute_time_stat(const std::vector<Duration> &samples) {
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if (samples.size() == 0) {
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return {Duration::zero(), Duration::zero(), Duration::zero(),
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Duration::zero(), 0.0};
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}
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// standard deviation calculated using Rapid calculation method:
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// http://en.wikipedia.org/wiki/Standard_deviation#Rapid_calculation_methods
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double a = 0, q = 0;
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size_t n = 0;
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int64_t sum = 0;
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auto res = TimeStat<Duration>{Duration::max(), Duration::min()};
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for (const auto &t : samples) {
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++n;
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res.min = std::min(res.min, t);
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res.max = std::max(res.max, t);
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sum += t.count();
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auto na = a + (t.count() - a) / n;
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q += (t.count() - a) * (t.count() - na);
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a = na;
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}
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} else {
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const auto &stat = w->stats;
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for (unsigned int i = 0; i < stat.start_times.size(); i++) {
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if (i >= stat.connect_times.size() ||
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i >= stat.time_to_first_bytes.size()) {
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continue; // rule out cases where we started but didn't connect or get
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// the first byte (errors)
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}
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std::chrono::microseconds t;
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if (type == STAT_CONNECT) {
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t = std::chrono::duration_cast<std::chrono::microseconds>(
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stat.connect_times[i] - stat.start_times[i]);
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} else if (type == STAT_FIRST_BYTE) {
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t = std::chrono::duration_cast<std::chrono::microseconds>(
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stat.time_to_first_bytes[i] - stat.start_times[i]);
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} else {
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return -1;
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}
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if (lower <= t.count() && t.count() <= upper) {
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++m;
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}
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}
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}
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}
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return (m / static_cast<double>(n)) * 100;
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res.mean = Duration(sum / n);
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res.sd = Duration(static_cast<typename Duration::rep>(sqrt(q / n)));
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res.within_sd = within_sd(samples, res.mean, res.sd);
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return res;
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}
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} // namespace
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namespace {
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TimeStats
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process_time_stats(const std::vector<std::unique_ptr<Worker>> &workers) {
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auto ts = TimeStats();
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int64_t request_sum = 0;
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int64_t connect_sum = 0;
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int64_t ttfb_sum = 0;
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size_t m = 0;
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size_t n = 0;
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ts.request_time_min = std::chrono::microseconds::max();
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ts.request_time_max = std::chrono::microseconds::min();
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ts.request_within_sd = 0.;
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ts.connect_time_min = std::chrono::microseconds::max();
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ts.connect_time_max = std::chrono::microseconds::min();
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ts.connect_within_sd = 0.;
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ts.ttfb_min = std::chrono::microseconds::max();
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ts.ttfb_max = std::chrono::microseconds::min();
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ts.ttfb_within_sd = 0.;
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// standard deviation calculated using Rapid calculation method:
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// http://en.wikipedia.org/wiki/Standard_deviation#Rapid_calculation_methods
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double request_a = 0, request_q = 0;
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double connect_a = 0, connect_q = 0;
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double ttfb_a = 0, ttfb_q = 0;
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size_t nrequest_times = 0, nttfb_times = 0;
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for (const auto &w : workers) {
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nrequest_times += w->stats.req_stats.size();
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nttfb_times += w->stats.ttfbs.size();
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}
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std::vector<std::chrono::microseconds> request_times;
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request_times.reserve(nrequest_times);
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std::vector<std::chrono::microseconds> connect_times, ttfb_times;
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connect_times.reserve(nttfb_times);
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ttfb_times.reserve(nttfb_times);
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for (const auto &w : workers) {
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const auto stat = w->stats;
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for (const auto &req_stat : w->stats.req_stats) {
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if (!req_stat.completed) {
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continue;
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}
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++n;
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auto request_t = std::chrono::duration_cast<std::chrono::microseconds>(
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req_stat.stream_close_time - req_stat.request_time);
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ts.request_time_min = std::min(ts.request_time_min, request_t);
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ts.request_time_max = std::max(ts.request_time_max, request_t);
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request_sum += request_t.count();
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auto request_na = request_a + (request_t.count() - request_a) / n;
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request_q =
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request_q +
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(request_t.count() - request_a) * (request_t.count() - request_na);
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request_a = request_na;
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}
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for (unsigned int i = 0; i < stat.start_times.size(); i++) {
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if (i >= stat.connect_times.size() ||
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i >= stat.time_to_first_bytes.size()) {
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continue; // rule out cases where we started but didn't connect or get
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// the first byte (errors)
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}
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++m;
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auto connect_t = std::chrono::duration_cast<std::chrono::microseconds>(
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stat.connect_times[i] - stat.start_times[i]);
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ts.connect_time_min = std::min(ts.connect_time_min, connect_t);
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ts.connect_time_max = std::max(ts.connect_time_max, connect_t);
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connect_sum += connect_t.count();
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auto ttfb_t = std::chrono::duration_cast<std::chrono::microseconds>(
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stat.time_to_first_bytes[i] - stat.start_times[i]);
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ts.ttfb_min = std::min(ts.ttfb_min, ttfb_t);
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ts.ttfb_max = std::max(ts.ttfb_max, ttfb_t);
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ttfb_sum += ttfb_t.count();
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auto connect_na = connect_a + (connect_t.count() - connect_a) / m;
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connect_q =
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connect_q +
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(connect_t.count() - connect_a) * (connect_t.count() - connect_na);
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connect_a = connect_na;
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auto ttfb_na = ttfb_a + (ttfb_t.count() - ttfb_a) / m;
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ttfb_q = ttfb_q + (ttfb_t.count() - ttfb_a) * (ttfb_t.count() - ttfb_na);
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ttfb_a = ttfb_na;
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}
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}
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if (n == 0) {
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ts.request_time_max = ts.request_time_min =
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std::chrono::microseconds::zero();
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ts.connect_time_max = ts.connect_time_min =
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std::chrono::microseconds::zero();
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ts.ttfb_max = ts.ttfb_min = std::chrono::microseconds::zero();
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return ts;
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request_times.push_back(
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std::chrono::duration_cast<std::chrono::microseconds>(
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req_stat.stream_close_time - req_stat.request_time));
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}
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ts.request_time_mean = std::chrono::microseconds(request_sum / n);
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ts.request_time_sd = std::chrono::microseconds(
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static_cast<std::chrono::microseconds::rep>(sqrt(request_q / n)));
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const auto &stat = w->stats;
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// rule out cases where we started but didn't connect or get the
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// first byte (errors). We will get connect event before FFTB.
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assert(stat.start_times.size() >= stat.ttfbs.size());
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assert(stat.connect_times.size() >= stat.ttfbs.size());
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for (size_t i = 0; i < stat.ttfbs.size(); ++i) {
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connect_times.push_back(
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std::chrono::duration_cast<std::chrono::microseconds>(
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stat.connect_times[i] - stat.start_times[i]));
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ts.connect_time_mean = std::chrono::microseconds(connect_sum / m);
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ts.connect_time_sd = std::chrono::microseconds(
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static_cast<std::chrono::microseconds::rep>(sqrt(connect_q / m)));
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ttfb_times.push_back(
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std::chrono::duration_cast<std::chrono::microseconds>(
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stat.ttfbs[i] - stat.start_times[i]));
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}
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}
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ts.ttfb_mean = std::chrono::microseconds(ttfb_sum / m);
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ts.ttfb_sd = std::chrono::microseconds(
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static_cast<std::chrono::microseconds::rep>(sqrt(ttfb_q / m)));
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ts.request_within_sd = within_sd(workers, ts.request_time_mean,
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ts.request_time_sd, n, STAT_REQUEST);
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ts.connect_within_sd = within_sd(workers, ts.connect_time_mean,
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ts.connect_time_sd, m, STAT_CONNECT);
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ts.ttfb_within_sd =
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within_sd(workers, ts.ttfb_mean, ts.ttfb_sd, m, STAT_FIRST_BYTE);
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return ts;
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return {compute_time_stat(request_times), compute_time_stat(connect_times),
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compute_time_stat(ttfb_times)};
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}
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} // namespace
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@ -1521,7 +1463,7 @@ int main(int argc, char **argv) {
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}
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}
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auto time_stats = process_time_stats(workers);
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auto ts = process_time_stats(workers);
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// Requests which have not been issued due to connection errors, are
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// counted towards req_failed and req_error.
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@ -1554,32 +1496,23 @@ status codes: )" << stats.status[2] << " 2xx, " << stats.status[3] << " 3xx, "
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traffic: )" << stats.bytes_total << " bytes total, " << stats.bytes_head
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<< " bytes headers, " << stats.bytes_body << R"( bytes data
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min max mean sd +/- sd
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time for request: )" << std::setw(10)
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<< util::format_duration(time_stats.request_time_min) << " "
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<< std::setw(10)
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<< util::format_duration(time_stats.request_time_max) << " "
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<< std::setw(10)
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<< util::format_duration(time_stats.request_time_mean) << " "
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<< std::setw(10)
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<< util::format_duration(time_stats.request_time_sd) << std::setw(9)
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<< util::dtos(time_stats.request_within_sd) << "%"
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time for request: )" << std::setw(10) << util::format_duration(ts.request.min)
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<< " " << std::setw(10) << util::format_duration(ts.request.max)
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<< " " << std::setw(10) << util::format_duration(ts.request.mean)
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<< " " << std::setw(10) << util::format_duration(ts.request.sd)
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<< std::setw(9) << util::dtos(ts.request.within_sd) << "%"
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<< "\ntime for connect: " << std::setw(10)
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<< util::format_duration(time_stats.connect_time_min) << " "
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<< std::setw(10)
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<< util::format_duration(time_stats.connect_time_max) << " "
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<< std::setw(10)
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<< util::format_duration(time_stats.connect_time_mean) << " "
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<< std::setw(10)
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<< util::format_duration(time_stats.connect_time_sd) << std::setw(9)
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<< util::dtos(time_stats.connect_within_sd) << "%"
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<< util::format_duration(ts.connect.min) << " " << std::setw(10)
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<< util::format_duration(ts.connect.max) << " " << std::setw(10)
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<< util::format_duration(ts.connect.mean) << " " << std::setw(10)
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<< util::format_duration(ts.connect.sd) << std::setw(9)
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<< util::dtos(ts.connect.within_sd) << "%"
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<< "\ntime to 1st byte: " << std::setw(10)
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<< util::format_duration(time_stats.ttfb_min) << " "
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<< std::setw(10) << util::format_duration(time_stats.ttfb_max)
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<< " " << std::setw(10)
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<< util::format_duration(time_stats.ttfb_mean) << " "
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<< std::setw(10) << util::format_duration(time_stats.ttfb_sd)
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<< std::setw(9) << util::dtos(time_stats.ttfb_within_sd) << "%"
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<< std::endl;
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<< util::format_duration(ts.ttfb.min) << " " << std::setw(10)
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<< util::format_duration(ts.ttfb.max) << " " << std::setw(10)
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<< util::format_duration(ts.ttfb.mean) << " " << std::setw(10)
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<< util::format_duration(ts.ttfb.sd) << std::setw(9)
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<< util::dtos(ts.ttfb.within_sd) << "%" << std::endl;
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SSL_CTX_free(ssl_ctx);
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34
src/h2load.h
34
src/h2load.h
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@ -94,21 +94,21 @@ struct RequestStat {
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bool completed;
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};
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template<typename Duration>
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struct TimeStat {
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// min, max, mean and sd (standard deviation)
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Duration min, max, mean, sd;
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// percentage of samples inside mean -/+ sd
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double within_sd;
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};
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struct TimeStats {
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// time for request: max, min, mean and sd (standard deviation)
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std::chrono::microseconds request_time_max, request_time_min,
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request_time_mean, request_time_sd;
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// percentage of number of requests inside mean -/+ sd
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double request_within_sd;
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// time for connect: max, min, mean and sd (standard deviation)
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std::chrono::microseconds connect_time_max, connect_time_min,
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connect_time_mean, connect_time_sd;
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// percentage of number of connects inside mean -/+ sd
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double connect_within_sd;
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// time to first byte: max, min, mean and sd (standard deviation)
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std::chrono::microseconds ttfb_max, ttfb_min, ttfb_mean, ttfb_sd;
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// percentage of number of connects inside mean -/+ sd
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double ttfb_within_sd;
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// time for request
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TimeStat<std::chrono::microseconds> request;
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// time for connect
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TimeStat<std::chrono::microseconds> connect;
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// time to first byte (TTFB)
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TimeStat<std::chrono::microseconds> ttfb;
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};
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enum TimeStatType { STAT_REQUEST, STAT_CONNECT, STAT_FIRST_BYTE };
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@ -148,8 +148,8 @@ struct Stats {
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std::vector<std::chrono::steady_clock::time_point> start_times;
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// time to connect
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std::vector<std::chrono::steady_clock::time_point> connect_times;
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// time to first byte
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std::vector<std::chrono::steady_clock::time_point> time_to_first_bytes;
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// time to first byte (TTFB)
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std::vector<std::chrono::steady_clock::time_point> ttfbs;
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};
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enum ClientState { CLIENT_IDLE, CLIENT_CONNECTED };
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@ -236,7 +236,7 @@ struct Client {
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void record_request_time(RequestStat *req_stat);
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void record_start_time(Stats *stat);
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void record_connect_time(Stats *stat);
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void record_time_to_first_byte(Stats *stat);
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void record_ttfb(Stats *stat);
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void signal_write();
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};
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