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Revision 6 as of 2006-05-23 19:33:41
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Editor: FredrikLundh
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Revision 7 as of 2006-05-24 08:47:43
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Editor: SteveHolden
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 * Frame optimizations  * Frame optimizations: once a function is called it retains the allocated frame for use in future calls, avoiding allocation and initialization overhead. Frame size has also been slightly reduced

Things we think the Python community will like.

Assorted tweaks:

  • Frame optimizations: once a function is called it retains the allocated frame for use in future calls, avoiding allocation and initialization overhead. Frame size has also been slightly reduced
  • Made Gzip readline 30-40% faster (BobIppolito)

  • Speed up Unicode operations (AndrewDalke, FredrikLundh). Most notable, repeat and most search operations (find, index, count, in) are now a lot faster. Also, rsplit is now as fast as split, and splitlines is nearly as fast as a plain split("\n"). Current stringbench results:

str(ms) uni(ms) %       comment
-----------------------------------------------------
2374.13 3786.27 62.7    TOTAL 2.5a2
2347.33 1335.65 175.7   TOTAL trunk
  • Patch 1335972 was a combination bugfix+speedup for string->int conversion. These are the speedups measured on my Windows box for decimal strings of various lengths. Note that the difference between 9 and 10 is the difference between short and long Python ints on a 32-bit box. The patch doesn't actually do anything to speed conversion to long directly; the speedup in those cases is solely due to due to detecting "unsigned long" overflow more quickly:

length speedup
------ -------
 1       12.4%
 2       15.7%
 3       20.6%
 4       28.1%
 5       33.2%
 6       37.5%
 7       41.9%
 8       46.3%
 9       51.2%
10       19.5%
11       19.9%
12       23.9%
13       23.7%
14       23.3%
15       24.9%
16       25.3%
17       28.3%
18       27.9%
19       35.7%
  • The struct module has been rewritten to pre-compile struct descriptors (similar to the RE module). On average, this leads to a 20% speedup [BobIppolito].

NeedForSpeed/Successes (last edited 2008-11-15 14:00:10 by localhost)

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