Performance issues, too1

[Stanley.Hopcroft at Dest.gov.au]

Dear Sir,

I am writing to thank you for your letter and say, 

> -----Original Message-----

> ------------------------------
> 
> Message: 2
> Date: Tue, 2 Jan 2007 08:26:34 +0100 (CET)
> From: Daniel Meyer <eagle at cyberdelia.de>
> Subject: Re: [Nagios-users] Performance issues, too
> 
> Hi there, and happy new year :-)
> 
> Program Running Time:                 10d 21h 22m 42s
> 
> So, for almost eleven days nagios runs smoothly now, no more 
> latency problems. I'll try it again with EPN (but still 
> without perlcache) now.
>

Context is massive memory leak with ePN. Leak goes when ePN is removed.

Firstly, look at the caveats for ePN at
http://nagios.sourceforge.net/docs/2_0/embeddedperl.html

There should be added another major caveat to this: depending on your
plugins you may have a 
bigger or smaller leak, however leak it will.

For me, I wouldn't consider Nagios without ePN since I code most of my
plugins in Perl and the advantages
for me (and this installation) outweigh the leak.

Finally about the meaning of the configure switches for ePN.

1 --enable-embedded-perl

This builds Perl into the Nagios executable and at the least means that
your system does
__not__ fork a new process to run Perl plugins. Instead, Perl is parsed
and run by direct
calls to the Nagios binary.

So, setting this switch saves a context switch.

2 --with-perl-cache

If in addition, this switch is set, the Perl plugin is compiled only
once (otherwise, each time
Nagios goes to run a Perl plugin, it recompiles it). The resultant Perl
op code tree remains in
memory.

Unfortuntaely, for reasons that are not clear to me, this is the source
of the leak.



 
> Danny
> -- 

Yours sincerely.

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