[issue1943] improved allocation of PyUnicode objects

[Marc-Andre Lemburg]

Marc-Andre Lemburg <mal at egenix.com> added the comment:

Antoine, I think we have to make a decision here: I'm still -1 on
changing PyUnicodeObject to be a PyVarObject, but do like your
experiments with the free lists.

I also still believe that tuning the existing parameters in the Unicode
implementation and pymalloc would give a better performance gain than
what your patch achieves. 

Setting KEEPALIVE_SIZE_LIMIT to 32 would be a first start in that direction.

However, if you insist on changing the PyUnicodeObject structure, I'll
have to reject the patch.

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<http://bugs.python.org/issue1943>
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