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chore: show moving P99 latency in dfly_bench (#5027)

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As opposted to the cumulatative one that is shown at the end.
The reason for this: if P99 went up temporarily - it does not go back easily and stays up.

Signed-off-by: Roman Gershman <roman@dragonflydb.io>
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Roman Gershman 2025-04-30 18:13:36 +03:00 • committed by GitHub
parent ae4615b470
commit dced0371d3
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1 changed files with 10 additions and 6 deletions
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16
src/server/dfly_bench.cc
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@ -365,7 +365,7 @@ string CommandGenerator::FillGet(string_view key) {
}
struct ClientStats {
base::Histogram hist;
base::Histogram total_hist, online_hist;
uint64_t num_responses = 0;
uint64_t hit_count = 0;
@ -374,7 +374,9 @@ struct ClientStats {
unsigned num_clients = 0;
ClientStats& operator+=(const ClientStats& o) {
hist.Merge(o.hist);
total_hist.Merge(o.total_hist);
online_hist.Merge(o.online_hist);
num_responses += o.num_responses;
hit_count += o.hit_count;
hit_opportunities += o.hit_opportunities;
@ -710,7 +712,8 @@ static string_view FindLine(io::Bytes buf) {
void Driver::PopRequest() {
uint64_t now = absl::GetCurrentTimeNanos();
uint64_t usec = (now - reqs_.front().start) / 1000;
stats_.hist.Add(usec);
stats_.online_hist.Add(usec);
stats_.total_hist.Add(usec);
stats_.hit_opportunities += reqs_.front().might_hit;
++received_;
reqs_.pop();
@ -947,6 +950,7 @@ void WatchFiber(size_t num_shards, atomic_bool* finish_signal, ProactorPool* pp)
done_max = max(done_max, maxd);
done_min = min(done_min, mind);
max_pending = max(max_pending, max_pend);
client->stats.online_hist.Clear();
});
uint64_t total_ms = (now - start_time) / 1'000'000;
@ -957,7 +961,7 @@ void WatchFiber(size_t num_shards, atomic_bool* finish_signal, ProactorPool* pp)
double hitrate = stats.hit_opportunities > 0
? 100 * double(stats.hit_count) / double(stats.hit_opportunities)
: 0;
unsigned latency = stats.hist.Percentile(99);
unsigned latency = stats.online_hist.Percentile(99);
CONSOLE_INFO << total_ms / 1000 << "s: " << StrFormat("%.1f", done_perc)
<< "% done, RPS(now/agg): " << period_resp_cnt * 1000 / period_ms << "/"
@ -1193,13 +1197,13 @@ int main(int argc, char* argv[]) {
CONSOLE_INFO << "\nTotal time: " << duration
<< ". Overall number of requests: " << summary.num_responses
<< ", QPS: " << (dur_sec ? StrCat(summary.num_responses / dur_sec) : "nan")
<< ", P99 lat: " << summary.hist.Percentile(99) << "us";
<< ", P99 lat: " << summary.total_hist.Percentile(99) << "us";
if (summary.num_errors) {
CONSOLE_INFO << "Got " << summary.num_errors << " error responses!";
}
CONSOLE_INFO << "Latency summary, all times are in usec:\n" << summary.hist.ToString();
CONSOLE_INFO << "Latency summary, all times are in usec:\n" << summary.total_hist.ToString();
if (summary.hit_opportunities) {
CONSOLE_INFO << "----------------------------------\nHit rate: "
<< 100 * double(summary.hit_count) / double(summary.hit_opportunities) << "%\n";