CPU usage command for monitor script

Question

Is there a command for FreeBSD (except the top -P) I could use to monitor my dedicated server CPU usage? I am in progress of writting my bash script which will notify me as soon as any of the CPU core will be reaching 100% usage.

Thats why I need some other command than top -P because it takes some time for the top to calculate the usage on the first run and than wouldnt work for per usage command.

Have you considered running a real monitoring system, like Munin (in the ports tree)? — Chris S, Mar 07 '14 at 04:54
It is not easy to write this script in bash. Quick example on perl: https://gist.github.com/citrin/9411934 — citrin, Mar 07 '14 at 13:57

score 3 · Accepted Answer · edited Mar 10 '14 at 21:16

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CPU load information can be obtained in shell script from sysctl kern.cp_times. This is commulative counters, and to get load in % you need derivative, e. g. get kern.cp_times with 1 minute interval and divide counters by 60.

But more easy to use existing monitoring systems like Nagios (there are many monitoring systems, but no perfect and I can't suggest best system).

edited Mar 10 '14 at 21:16

voretaq7

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answered Mar 07 '14 at 12:56

citrin

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score 1 · Answer 2 · answered Mar 07 '14 at 07:59

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You could always install sysstat

Then do the following: sar -u | grep 'Average' | awk '{print 100-$8}'

Which will take 100 & remove the idle percent.

answered Mar 07 '14 at 07:59

Sayajin

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There is no `sar` on the FreeBSD systems. – Lucas Mar 07 '14 at 14:21

CPU usage command for monitor script

2 Answers2