[Twisted-Python] Twisted Memory Leaks & Epoll
Andrew Bennetts
andrew-twisted at puzzling.org
Tue May 1 07:38:10 MDT 2007
Matthew Glubb wrote:
[...]
> For the purposes of diagnosing the cause of the leak (C extension,
> python, twisted, or my code) I have removed external library
> dependencies and I have also swapped out reactors. The leak persists.
Those are all good steps to take to isolate the problem.
> Does anyone have any good tips for diagnosing leaks under twisted?
Basically, the same as for any other long-lived Python program:
* try to find a minimal case that reproduces the problem, e.g. a simple
request that leaks some bytes when repeated, or even better a simple
function call, and hope the cause becomes obvious as you narrow it down
* try memory profilers like http://pysizer.8325.org/
* try my crude hack: http://twistedmatrix.com/users/spiv/countrefs.py
* try to reproduce without any C extensions, to determine if the leak is in a
C extension or pure python code
-Andrew.
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