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Latency monitor: don't add new samples in the same second.

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Instead we update the old sample with the new latency if it is greater.
This commit is contained in:
antirez 2014-07-01 17:12:09 +02:00
parent 83beaa886c
commit f35abe2ff5
1 changed files with 11 additions and 0 deletions
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11
src/latency.c
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@ -69,6 +69,8 @@ void latencyMonitorInit(void) {
* server.latency_monitor_threshold. */ * server.latency_monitor_threshold. */
void latencyAddSample(char *event, mstime_t latency) { void latencyAddSample(char *event, mstime_t latency) {
struct latencyTimeSeries *ts = dictFetchValue(server.latency_events,event); struct latencyTimeSeries *ts = dictFetchValue(server.latency_events,event);
time_t now = time(NULL);
int prev;
/* Create the time series if it does not exist. */ /* Create the time series if it does not exist. */
if (ts == NULL) { if (ts == NULL) {
@ -79,6 +81,15 @@ void latencyAddSample(char *event, mstime_t latency) {
dictAdd(server.latency_events,zstrdup(event),ts); dictAdd(server.latency_events,zstrdup(event),ts);
} }
/* If the previous sample is in the same second, we update our old sample
* if this latency is > of the old one, or just return. */
prev = (ts->idx + LATENCY_TS_LEN - 1) % LATENCY_TS_LEN;
if (ts->samples[prev].time == now) {
if (latency > ts->samples[prev].latency)
ts->samples[prev].latency = latency;
return;
}
ts->samples[ts->idx].time = time(NULL); ts->samples[ts->idx].time = time(NULL);
ts->samples[ts->idx].latency = latency; ts->samples[ts->idx].latency = latency;
if (latency > ts->max) ts->max = latency; if (latency > ts->max) ts->max = latency;