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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks very much for the pointer – it’s good to know that I’m
not alone in my troubles. I’m now actually planning on writing a ProcManager
based on FCGI::Engine::ProcManager that incorporates some true process
management – a la MaxRequestsPerChild – rather than just a loop to startup X
childs and then a blocking wait().<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>v/r<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>-matt pitts<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Matthieu Codron
[mailto:matthieu@codron.org] <br>
<b>Sent:</b> Monday, March 31, 2008 5:22 AM<br>
<b>To:</b> The elegant MVC web framework<br>
<b>Subject:</b> Re: [Catalyst] Memory leak under FastCGI?<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>There was something about growing FastCGI processes in the
Catalyst advent calendar: <o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><a href="http://www.catalystframework.org/calendar/2007/18">http://www.catalystframework.org/calendar/2007/18</a><o:p></o:p></p>
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<p class=MsoNormal>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.<br>
<o:p></o:p></p>
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<p class=MsoNormal><span class=gmailquote>On 3/19/08, <b>Matt Pitts</b> <<a
href="mailto:mpitts@a3its.com">mpitts@a3its.com</a>> wrote:</span> <o:p></o:p></p>
<p class=MsoNormal>We have a Catalyst app that I recently (about a month ago)
converted<br>
from running under mod_fcgid to external under mod_fastcgi and it<br>
appears to be leaking memory. There are 2 application backends and they<br>
both suffered oom-killer events within six minutes of one another<br>
yesterday and one of them again this morning after a cron job ran that<br>
experienced some deep recursion calls.<br>
<br>
Both backends were running out of PARs when the first OOM events<br>
occurred. To eliminate the PAR setup itself as a cause, I started one of<br>
the backends by directly invoking myapp_fastcgi.pla and its memory<br>
behavior is the same, so I'm pretty confident the invocation via PAR is<br>
not a cause.<br>
<br>
I also checked my versions of CGI::FormBuilder to ensure I was up to<br>
3.501 and these all checked out.<br>
<br>
I have not yet determined if the conversion from mod_fcgid to<br>
mod_fastcgi external is when the RAM usage started climbing - still<br>
awaiting system reports - but, there haven't been an substantial changes<br>
to the app since then that I would consider potential causes of a memory<br>
leak. I'm guessing it's been there for a while, but it's only now<br>
evident because the app instances were getting automatically recycled by<br>
mod_fcgid and now they're not.<br>
<br>
I'm hoping someone here might have some light to shine on common FastCGI<br>
memory leak issues.<br>
<br>
Is it generally an acceptable practice to just restart the external<br>
fastcgi process periodically to free its memory?<br>
<br>
Any input is greatly appreciated.<br>
<br>
v/r<br>
-matt pitts<br>
<br>
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