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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.

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Have you considered running a real monitoring system, like Munin (in the ports tree)? –  Chris S Mar 7 at 4:54
    
Or monit? Which, is a nice light tool. –  Zoredache Mar 7 at 5:09
    
It is not easy to write this script in bash. Quick example on perl: gist.github.com/citrin/9411934 –  citrin Mar 7 at 13:57

2 Answers 2

up vote 3 down vote accepted

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).

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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.

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There is no sar on the FreeBSD systems. –  Lucas Mar 7 at 14:21

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