I think you will find that gprs devices will drop off the network but the router will still keep the coonection open. The gprs device will then reconnect on a different connection and port. So you will need to clean up old connections used by that device. Hope that helps John Aherne On Fri, Mar 19, 2010 at 2:53 PM, Don Schoeman <don@delphexonline.com> wrote:

Hi Andrew, thanks for taking the time to comment on my email.

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.

Thanks again for your help.

Kind Regards, Don

Andrew Bennetts wrote:

Don Schoeman wrote:

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.

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.

I receive less than 30 connections though so there must be some kind of leak. The error I'm getting is the following:

30 is much less than 1024, though, so a leak does sound probable.

[...]

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?

There's always strace, or looking in /proc/PID/fd.

I am using Twisted version 8.2.0 on Ubuntu Server Edition 9.10

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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