29ca87955e
The measured latency(duration) includes the list below, which can be shown by `INFO STATS`. ``` eventloop_cycles // ever increasing counter eventloop_duration_sum // cumulative duration of eventloop in microseconds eventloop_duration_cmd_sum // cumulative duration of executing commands in microseconds instantaneous_eventloop_cycles_per_sec // average eventloop count per second in recent 1.6s instantaneous_eventloop_duration_usec // average single eventloop duration in recent 1.6s ``` Also added some experimental metrics, which are shown only when `INFO DEBUG` is called. This section isn't included in the default INFO, or even in `INFO ALL` and the fields in this section can change in the future without considering backwards compatibility. ``` eventloop_duration_aof_sum // cumulative duration of writing AOF eventloop_duration_cron_sum // cumulative duration cron jobs (serverCron, beforeSleep excluding IO and AOF) eventloop_cmd_per_cycle_max // max number of commands executed in one eventloop eventloop_duration_max // max duration of one eventloop ``` All of these are being reset by CONFIG RESETSTAT
109 lines
4.4 KiB
C
109 lines
4.4 KiB
C
/* latency.h -- latency monitor API header file
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* See latency.c for more information.
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*
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* ----------------------------------------------------------------------------
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*
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* Copyright (c) 2014, Salvatore Sanfilippo <antirez at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __LATENCY_H
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#define __LATENCY_H
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#define LATENCY_TS_LEN 160 /* History length for every monitored event. */
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/* Representation of a latency sample: the sampling time and the latency
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* observed in milliseconds. */
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struct latencySample {
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int32_t time; /* We don't use time_t to force 4 bytes usage everywhere. */
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uint32_t latency; /* Latency in milliseconds. */
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};
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/* The latency time series for a given event. */
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struct latencyTimeSeries {
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int idx; /* Index of the next sample to store. */
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uint32_t max; /* Max latency observed for this event. */
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struct latencySample samples[LATENCY_TS_LEN]; /* Latest history. */
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};
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/* Latency statistics structure. */
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struct latencyStats {
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uint32_t all_time_high; /* Absolute max observed since latest reset. */
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uint32_t avg; /* Average of current samples. */
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uint32_t min; /* Min of current samples. */
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uint32_t max; /* Max of current samples. */
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uint32_t mad; /* Mean absolute deviation. */
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uint32_t samples; /* Number of non-zero samples. */
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time_t period; /* Number of seconds since first event and now. */
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};
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void latencyMonitorInit(void);
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void latencyAddSample(const char *event, mstime_t latency);
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/* Latency monitoring macros. */
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/* Start monitoring an event. We just set the current time. */
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#define latencyStartMonitor(var) if (server.latency_monitor_threshold) { \
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var = mstime(); \
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} else { \
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var = 0; \
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}
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/* End monitoring an event, compute the difference with the current time
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* to check the amount of time elapsed. */
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#define latencyEndMonitor(var) if (server.latency_monitor_threshold) { \
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var = mstime() - var; \
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}
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/* Add the sample only if the elapsed time is >= to the configured threshold. */
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#define latencyAddSampleIfNeeded(event,var) \
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if (server.latency_monitor_threshold && \
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(var) >= server.latency_monitor_threshold) \
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latencyAddSample((event),(var));
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/* Remove time from a nested event. */
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#define latencyRemoveNestedEvent(event_var,nested_var) \
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event_var += nested_var;
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typedef struct durationStats {
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unsigned long long cnt;
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unsigned long long sum;
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unsigned long long max;
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} durationStats;
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typedef enum {
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EL_DURATION_TYPE_EL = 0, // cumulative time duration metric of the whole eventloop
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EL_DURATION_TYPE_CMD, // cumulative time duration metric of executing commands
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EL_DURATION_TYPE_AOF, // cumulative time duration metric of flushing AOF in eventloop
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EL_DURATION_TYPE_CRON, // cumulative time duration metric of cron (serverCron and beforeSleep, but excluding IO and AOF)
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EL_DURATION_TYPE_NUM
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} DurationType;
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void durationAddSample(int type, monotime duration);
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#endif /* __LATENCY_H */
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