[Catalyst] Memory leak under FastCGI?

Matthieu Codron matthieu at codron.org
Mon Mar 31 10:22:17 BST 2008


There was something about growing FastCGI processes in the Catalyst advent
calendar:

http://www.catalystframework.org/calendar/2007/18

In short: Apparently this is normal behavior, and the article recommends
you, like you suggested, to periodically restart fastcgi processes to keep
memory usage reasonable.

On 3/19/08, Matt Pitts <mpitts at a3its.com> wrote:
>
> We have a Catalyst app that I recently (about a month ago) converted
> from running under mod_fcgid to external under mod_fastcgi and it
> appears to be leaking memory. There are 2 application backends and they
> both suffered oom-killer events within six minutes of one another
> yesterday and one of them again this morning after a cron job ran that
> experienced some deep recursion calls.
>
> Both backends were running out of PARs when the first OOM events
> occurred. To eliminate the PAR setup itself as a cause, I started one of
> the backends by directly invoking myapp_fastcgi.pla and its memory
> behavior is the same, so I'm pretty confident the invocation via PAR is
> not a cause.
>
> I also checked my versions of CGI::FormBuilder to ensure I was up to
> 3.501 and these all checked out.
>
> I have not yet determined if the conversion from mod_fcgid to
> mod_fastcgi external is when the RAM usage started climbing - still
> awaiting system reports - but, there haven't been an substantial changes
> to the app since then that I would consider potential causes of a memory
> leak. I'm guessing it's been there for a while, but it's only now
> evident because the app instances were getting automatically recycled by
> mod_fcgid and now they're not.
>
> I'm hoping someone here might have some light to shine on common FastCGI
> memory leak issues.
>
> Is it generally an acceptable practice to just restart the external
> fastcgi process periodically to free its memory?
>
> Any input is greatly appreciated.
>
> v/r
> -matt pitts
>
> _______________________________________________
> List: Catalyst at lists.scsys.co.uk
> Listinfo: http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/catalyst
> Searchable archive:
> http://www.mail-archive.com/catalyst@lists.scsys.co.uk/
> Dev site: http://dev.catalyst.perl.org/
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.scsys.co.uk/pipermail/catalyst/attachments/20080331/e9e80=
82c/attachment.htm


More information about the Catalyst mailing list