[Twisted-Python] Many connections and TIME_WAIT

Donal McMullan donal.mcmullan at gmail.com
Tue Jan 26 23:50:14 EST 2010

I've been prototyping a client that connects to thousands of servers and
calls some method. It's not real important to me at this stage whether
that's via xmlrpc, perspective broker, or something else.

What seems to happen on the client machine is that each network connection
that gets opened and then closed goes into a TIME_WAIT state, and eventually
there are so many connections in that state that it's impossible to create
any more.

I'm keeping an eye on the output of
netstat -an | wc -l
Initially I've got 569 entries there. When I run my test client, that ramps
up really quickly and peaks at about 2824. At that point, the client reports
a callRemoteFailure:

callRemoteFailure [Failure instance: Traceback (failure with no frames):
<class 'twisted.internet.error.ConnectionLost'>: Connection to the other
side was lost in a non-clean fashion: Connection lost.

Increasing the file descriptor limits doesn't seem to have any effect on

Is there an established Twisted sanctioned canonical way to free up this
resource? Or am I doing something wrong? I'm looking into tweaking
SO_REUSEADDR and SO_LINGER - that sound sane?

Just tapping the lazywebs to see if anyone's already seen this in the wild.

Thanks guys

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