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Wed May 25 23:00:51 CEST 2011 · https://mail.python.org/pipermail/python-dev/2011-May/111668.html

>> A new method called service_action is made available in BaseServer, called by
>> serve_forever loop. This useful in cases where Mixins can use it for cleanup
>> action. ForkingMixin class uses service_action to collect the zombie child
>> processes. Initial Patch by Justin Wark.
>
> Is it reasonable, performance-wise, to do this at every iteration of
> the loop (that is, at every incoming connection)?
>

I haven't measured it, but it's O(N) where N is the number of children.
It should be possible to optimize this by putting all the children in
a process group (the other advantage is that we wouldn't wait()
children not spawned by socketserver).

cf

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[Python-Dev] cpython: Fix closes issue #11109