I had got the same problem using '-r epoll' options when starting the app via twistd... When 1024 descriptors are opened, I can see 100% CPU.
Any ideas?
1. Edit /etc/sysctl.conf and place the following line there:
fs.file-max = 999999
2. Type $ sudo sysctl -p
3. Place the following two lines:
* soft nofile 999999
* hard nofile 999999
Either reboot, or also type in `ulimit -n 999999`
4. Check that $ ulimit -a shows your open fixes set to 999999
There's nothing special about 999999 - it's just some big number conveniently bigger than 1024. Enjoy.
Reza