Urgent: nagios + apan memory chewing up

[Stanley Hopcroft]

Dear Sir,

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

> From: "Chet Luther" <chet at rcn.com>
> To: <alikhalidi at excite.com>,
> 	<nagios-users at lists.sourceforge.net>
> Cc: <marcioqueiroz at vicom.com.br>
> Subject: Re: [Nagios-users] Urgent: nagios + apan memory chewing up
> Date: Thu, 14 Aug 2003 11:00:13 -0400
> 
> Ali,
>     Recompile Nagios without embedded perl or perl caching support.  I had
> this same problem, and it was due to global namespace pollution in the
> embedded perl cache.

would you mind providing some more detail about the analysis that lead
to this conclusion ?

This Nag ($this->nagios) is monitoring more services with less hardware
(Dell 350/256 MB, 200 hosts, 340 active services) using ePN and doesn't
show the problem reported by Ali. However, Ali's host could have a
greater load.

(The only problem I think may be ePN related is a Nag process hogs the
CPU and needs to be HUP'd, once each 2-4 weeks. The ePN memory leaks
are _much_ less dramatic: Nag gets restarted each fortnight or so when
the resident size above 60 MB or so)

In this case, I am using a lot of local Perl plugins (hemi mod_perl
safe) and some of the old 1.2.9 series (with some local mods).

The ePN support puts each plugin in it's own Perl package and then calls
it as a subroutine in that package; it seems unlikely therefore that
other variables are being trampled (impossible if the plugins use
lexicals - carefully because of the closure issues).

> The real solution to this problem would be rewriting
> all the perl plugins/extensions in a mod_perl safe way, but I don't see any
> initiative to get that done.
>

IIRC, Subhendu dealt with the ePN safety issues in the 1.3.x release (ie
sometime ago).

If there are more than 5 plugins that aren't mod_perl safe would you let
me know ?

Otherwise, would you write the list with the names of the malefactors ?
 
> Hope this helps,
> 
> Chet Luther
> chet at rcn.com

Yours sincerely.

-- 
------------------------------------------------------------------------
Stanley Hopcroft
------------------------------------------------------------------------

'...No man is an island, entire of itself; every man is a piece of the
continent, a part of the main. If a clod be washed away by the sea,
Europe is the less, as well as if a promontory were, as well as if a
manor of thy friend's or of thine own were. Any man's death diminishes
me, because I am involved in mankind; and therefore never send to know
for whom the bell tolls; it tolls for thee...'

from Meditation 17, J Donne.


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