[Twisted-Python] Error: filedescriptor out of range in select

John Aherne johnaherne at rocs.co.uk
Fri Mar 19 12:35:52 EDT 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.
>
>
> _______________________________________________
> Twisted-Python mailing listTwisted-Python at twistedmatrix.comhttp://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
>
>
> _______________________________________________
> Twisted-Python mailing list
> Twisted-Python at twistedmatrix.com
> http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://twistedmatrix.com/pipermail/twisted-python/attachments/20100319/af4777d3/attachment.htm 


More information about the Twisted-Python mailing list