Nagios memory usage 1.2 vs 1.1

[Bruce Elrick]

Hello,

Any comments would be appreciated.  I searched the SourceForge archive 
of this mailing list for "memory leak Perl" etc. and didn't find anything.

I've got a production Nagios server running 1.1 and a test/dev one 
upgraded to 1.2 (both using RPM installs running on Redhat 9, host 
servers are Compaq DL360, 1 CPU 1 GHz, 384 MB RAM, 256 MB swap, RAID 1 
36 GB SCSI drives).  Both instances run (nearly) identical check loads.

The 1.1 instance has a memory SIZE (as reported by 'top') of 780 kB and 
an RSS of 764 kB.

The 1.2 instance has a memory SIZE of 134 MB and and RSS of 116 MB.

Judging by changes we had to make to our Perl-based check scripts (and 
observing error messages), I can glean that 1.2 runs Perl-based check 
scripts in a persistent Perl interpreter using ExtUtils::Embed.  I also 
see that it runs them with an implicit "use strict;" directive.

Anyway, I can understand how this can be much more CPU and I/O efficient 
than forking a new Perl interpreter on each check.  However, I'm 
wondering if anyone has a metric as to whether the 134 MB size is 
reasonable?

I don't know whether Embed caches the compiled Perl intermediate code 
for the multiple check scripts that are called or how it manages memory, 
but even with a half dozen or fewer unique Perl-based check scripts and 
<100 services, I'm wondering whether 134 MB is reasonable or if there is 
a memory leak.

The memory usage started out at 3-4 MB after a few minutes, grew to 32 
MB overnight, then was at 134 MB after a day or so.  At this point, the 
response time of the Apache-based Admin Console for Nagios (and other 
Apache responses) is on the order of 5-10 seconds, presumably because of 
swaping of memory pages.

Anyone have similar observances or perhaps comments/advice?

Thanks,
Bruce Elrick


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