[issue11257] asyncore stores unnecessary object references

[Giampaolo Rodola']

Giampaolo Rodola' <g.rodola at gmail.com> added the comment:

I'd be fine with this. My only concern are performances.
I've tried this:
http://code.google.com/p/pyftpdlib/issues/attachmentText?id=152&aid=-7106494857544071944&name=bench.py&token=bd350bbd6909c7c2a70da55db15d24ed

Results:

plain dict: 722.26 Mb/sec
WeakValueDictionary: 659.76 Mb/sec

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<http://bugs.python.org/issue11257>
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