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This article details how to debug performance issues involving Livestatus. |
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This command will show you some statistics (run it in /omd/sites/<SITENAME>/var/log):
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OMD[mysite]~# grep "processed request in" $OMD_ROOT/var/log/cmc.log | cut -d" " -f9 | sed 's,$, 100 / 100 * p,' | dc | sort -n | uniq -c |
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OMD[mysite]~# cat $OMD_ROOT/var/log/cmc.log |grep -Po "client.*processed request in [\d]* ms" |sort -n |uniq -c |
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OMD[mysite]~# grep -Eo "request: GET \w+" $OMD_ROOT/var/log/cmc.log | uniq |sort -u request: GET eventconsoleevents request: GET hosts request: GET log request: GET services request: GET status request: GET timeperiods |
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OMD[mysite]~# cat $OMD_ROOT/var/log/cmc.log |grep "client 22" |grep "request" |
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In Setup → General → Global settings we have several settings to improve the log parsing.
| Maximum concurrent Livestatus connections | UsuallyTypically, the default value should be acceptable. If you have a larger number of users, views, or distributed monitoring, you can increase this value step-by-step (50 - 100 - 150) | |||||||
Maximum number of cached log messages | To speed up queries for historical data, the core keeps an in-memory cache of log file messages. This number can be configured here. A larger number needs requires more RAM. Note: even if you set this to 0, there might be some cases where messages need to be cached anyway. You can set this to one million if you have enough memory | |||||||
| History log rotation: Rotate by size (Limit of the size) | A log file rotation will be forced whenever its size exceeds that limit. In a large environment, you can increase this value to, e.g., 200mb. Checkmk will now need to parse the same amount of data through fewer files. | |||||||
| Maximum number of parsed lines per log file | To avoid large timeouts in the case of oversized history log files, the core limits the number of lines read from history log files. The limit is on a per-file base basis and can be configured here. Exceeding lines are ignored, and an error is logged in the CMC daemon log file. E.g.,:
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