Date: Mon, 4 Aug 2014 19:40:36 +0300 From: Stefan Parvu <sparvu@systemdatarecorder.org> To: David Wolfskill <david@catwhisker.org> Cc: freebsd-hackers@freebsd.org Subject: Re: cpu utilization break down via sysctl Message-ID: <20140804194036.be325ee5822bbcb2623db358@systemdatarecorder.org> In-Reply-To: <20140804162056.GP1228@albert.catwhisker.org> References: <20140804190923.95fec6a00d175ffee89c4af5@systemdatarecorder.org> <20140804162056.GP1228@albert.catwhisker.org>
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> Sure; I've done the data acquisition with sysctl & awk, then > post-processed that with a bit of Perl. I wrote some code in R to > generate graphs.... I did some similar stuff using RRDTool a whlie > back. Im planning in using BSD::Sysctl to fetch all needed values. > kern.cp_time output is an ordered quintuple showing (aggregate) CPU > counters for: > > * user > * nice > * system > * interrupt > * idle > I see. Cool. If I understood right these will be the break down for 4 vcpu system: $ sysctl kern.cp_times kern.cp_times: 28845 2060 22253 1805 1197920 27677 1477 22399 2109 1199180 32342 1649 19499 894 1198458 29670 1678 20324 1471 1199699 which maps to: time1: cpu0: user_28845: nice_2060: system_22253: intr_1805: idle_1197920 time1: cpu1: user_27677: nice_1477 system_22399 intr_2109: idle_1199180 time1: cpu2: user_32342: nice_1649: system_19499: intr_894: idle_1198458 time1: cpu3 user_29670: nice_1678: system_20324: intr_1471: idle_1199699 > For each core (or the aggregate), you need to look at an interval. Get > the differences for each of the 5 possible CPU states; the sum of those > differences is the total of CPU resources available during that > interval. Right I need to do delta between 2 readings to get the correct values. Same as in KSTAT in Solaris perl interface. One more check here: CPU_Utilization = User + System + Nice + Intr ? Many thanks indeed. I need to experiment with these ... -- Stefan Parvu <sparvu@systemdatarecorder.org>
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