Growing CPU utilization

[Thomas Guyot-Sionnest]

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On 06/01/09 06:14 PM, Marc Powell wrote:
> On Jan 6, 2009, at 4:23 PM, Bryan Wann wrote:
> 
>> Through process of elimination, I think I've tracked it down to perl
>> plugins. ePN is in use.  I'm tracking 11,309 services on 1,364  
>> hosts, 26%
>> of those service checks are perl (manubulon.com's check_snmp_mem,
>> check_snmp_load) and the rest are C (check_icmp, check_snmp).
> 
> Unless those perl plugins have been designed specifically to work with  
> ePN, then I wouldn't be too surprised to see oddness. ePN transforms  
> the plugin in a way that can cause unexpected breakage if the author  
> wasn't expecting it.
> 
> http://nagios.sourceforge.net/docs/3_0/embeddedperl.html and http://nagios.sourceforge.net/docs/3_0/epnplugins.html 
>   as well as most archive postings by Stanley Hopcroft can provide  
> insight as well as some troubleshooting hints (like using contrib/ 
> mini_epn for testing, though I have doubts it would show a gradual  
> problem such as this).
> 
> The simplest troubleshooting path may be to use the '# nagios: -epn'  
> flag to disable ePN processing on individual plugins (or all, then add  
> them back individually) to help identify the plugin that's causing the  
> issue.

I noticed the same thing; the system CPU time increase is directly
attributable to the memory leaks in Nagios and/or ePN.

That said, the speed at which memory leaks in Nagios 3.0 with the same
configuration and scripts is tremendously higher. There is very likely
some important leak(s) that got shipped with the 3.0.x release.

- --
Thomas
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