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https://github.com/fluencelabs/redis
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Latency monitor: don't add new samples in the same second.
Instead we update the old sample with the new latency if it is greater.
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@ -69,6 +69,8 @@ void latencyMonitorInit(void) {
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* server.latency_monitor_threshold. */
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void latencyAddSample(char *event, mstime_t latency) {
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struct latencyTimeSeries *ts = dictFetchValue(server.latency_events,event);
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time_t now = time(NULL);
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int prev;
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/* Create the time series if it does not exist. */
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if (ts == NULL) {
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@ -79,6 +81,15 @@ void latencyAddSample(char *event, mstime_t latency) {
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dictAdd(server.latency_events,zstrdup(event),ts);
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}
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/* If the previous sample is in the same second, we update our old sample
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* if this latency is > of the old one, or just return. */
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prev = (ts->idx + LATENCY_TS_LEN - 1) % LATENCY_TS_LEN;
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if (ts->samples[prev].time == now) {
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if (latency > ts->samples[prev].latency)
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ts->samples[prev].latency = latency;
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return;
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}
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ts->samples[ts->idx].time = time(NULL);
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ts->samples[ts->idx].latency = latency;
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if (latency > ts->max) ts->max = latency;
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