id	summary	reporter	owner	description	type	status	priority	milestone	component	resolution	keywords	cc	branch	branch_author	launchpad_bug
3290	Epoll reactor pauses for 10-15 seconds during high connection volume	kvogt		"I've included sample code below.  

Basically, when you flood the reactor with a couple thousand connections, the strace shows that the process blocks on epoll for 10-15 seconds.  Some connections eventually time out instead of being accept()'d by the reactor.

Make sure you have lots of fd's handy:

# ulimit -n 65536

Run the attached snippet with:

# twistd --python test.py --reactor epoll

Then test with:

# ab -c10000 -n10000 http://127.0.0.1/2000/bench

And tail the log:

# tail -f twistd.log"	defect	new	normal		core		epoll	exarkun