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Author Mark.Shannon
Recipients Jim.Jewett, Mark.Shannon, benjamin.peterson, giampaolo.rodola, gregory.p.smith, jcea, jcon, pitrou, pjenvey, rhettinger, terry.reedy, vstinner
Date 2012-04-02.15:21:12
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I'm not bothered by the regression in "silent_logging",
as it is a micro benchmark with a very short running time.

The regression in "mako" is, I think, caused by competition for the
data cache between the new dict implementation and the method-cache
used by _PyType_Lookup. Although the new-dict uses less memory overall,
the size of a single split-table dict (keys + value) is larger than a combined table.

Reducing the method-cache size from 2**10 to 2**9 allows the working set to fit better in the cache.
This fixes the regression in "mako", but makes OO programs that use few objects (such as richards) a bit slower.
Compared with tip, the new-dict implementation
is 4% slower, using 7% less memory for mako. 6% slower, using 5% less memory for richards.
Date User Action Args
2012-04-02 15:21:13Mark.Shannonsetrecipients: + Mark.Shannon, rhettinger, terry.reedy, gregory.p.smith, jcea, pitrou, vstinner, giampaolo.rodola, pjenvey, benjamin.peterson, jcon, Jim.Jewett
2012-04-02 15:21:13Mark.Shannonsetmessageid: <>
2012-04-02 15:21:12Mark.Shannonlinkissue13903 messages
2012-04-02 15:21:12Mark.Shannoncreate