[issue1943] improved allocation of PyUnicode objects

[Marc-Andre Lemburg]

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

I wasn't clear enough: my point was that your free list patch would
probably benefit from some tuning of the cut-off parameters. 15
characters appears to be too small (see the HISTORY file histogram). 

You'll likely get better results for 32 and 256 as cut-off values and by
increasing the max list sizes to higher values, e.g. 1024 for the 32
character slots and 146 for the 256 character slots (see the counts in
the histograms).

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