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<font face="Arial">Hi Andrew, thanks for taking the time to comment on
my email.<br>
<br>
I'm going to have to study your proposal to switch to poll/epoll anyway
since I am expecting more and more connections to be made over time.
This particular application is used to communicate with a bunch of GPRS
devices and I'm starting to think that these devices might not be
closing a connection properly which could perhaps lead to this
particular problem. I am going to discuss it with the manufacturers of
these devices as well.<br>
<br>
Thanks again for your help.<br>
<br>
Kind Regards,<br>
Don<br>
<br>
</font><br>
Andrew Bennetts wrote:
<blockquote
cite="mid:20100319125830.GA17997@steerpike.home.puzzling.org"
type="cite">
<pre wrap="">Don Schoeman wrote:
</pre>
<blockquote type="cite">
<pre wrap=""> Hi guys, I have started having this problem a few weeks ago and it
happens about once a week after which I have to restart my Twisted
based server to function again. It seems to be happening when I
make RPC calls using twisted.web.xmlrpc.Proxy. I have reason to
believe that I am either running out of file handles or connection
limits. I have up-sized my connection limits and ulimit -n gives
me 9000.
</pre>
</blockquote>
<pre wrap=""><!---->
Note though that select() has a builtin limit, which varies by platform
but is probably 1024 for you. So perhaps try the poll or epoll reactor
instead.
</pre>
<blockquote type="cite">
<pre wrap=""> I receive less than 30 connections though so there must be some
kind of leak. The error I'm getting is the following:
</pre>
</blockquote>
<pre wrap=""><!---->
30 is much less than 1024, though, so a leak does sound probable.
[...]
</pre>
<blockquote type="cite">
<pre wrap=""> Now I know this is a very generic error and it could mean a lot of
things, but how would I even start tracking the leak down? Is there
a way I can try and track the number of file descriptors?
</pre>
</blockquote>
<pre wrap=""><!---->
There's always strace, or looking in /proc/PID/fd.
</pre>
<blockquote type="cite">
<pre wrap=""> I am using Twisted version 8.2.0 on Ubuntu Server Edition 9.10
</pre>
</blockquote>
<pre wrap=""><!---->
Maybe try upgrading Twisted, preferably to 10.0.0? I'm not sure if a
bug related to your problems was fixed since 8.2.0, but a lot of bugs
have been fixed in that ~2 years. Hopefully there's a PPA somewhere
with a newer Twisted for your version of Ubuntu.
-Andrew.
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</pre>
</blockquote>
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