[Twisted-Python] Error: filedescriptor out of range in select
John Aherne
johnaherne at rocs.co.uk
Fri Mar 19 10:35:52 MDT 2010
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 at 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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