socket.accept error 24: To many open files

Question

I have a problem with open files under my Ubuntu 9.10 when running server in Python2.6 And main problem is that, that i don't know why it so..

I have set

ulimit -n = 999999

net.core.somaxconn = 999999

fs.file-max = 999999

and lsof gives me about 12000 open files when server is running.

And also i'm using epoll.

But after some time it's start giving exeption:

File "/usr/lib/python2.6/socket.py", line 195, in accept error: [Errno 24] Too many open files

And i don't know how it can reach file limit when it isn't reached.

Thanks for help)