[issue22847] Improve method cache efficiency

[Antoine Pitrou]

Antoine Pitrou added the comment:

It's not easy to get stable benchmark runs, but here is an example:

Report on Linux fsol 3.16.0-24-generic #32-Ubuntu SMP Tue Oct 28 13:07:32 UTC 2014 x86_64 x86_64
Total CPU cores: 4

### 2to3 ###
7.083762 -> 6.904087: 1.03x faster

### formatted_logging ###
Min: 0.351515 -> 0.330884: 1.06x faster
Avg: 0.352954 -> 0.332422: 1.06x faster
Significant (t=62.94)
Stddev: 0.00120 -> 0.00197: 1.6382x larger

### mako_v2 ###
Min: 0.035797 -> 0.034659: 1.03x faster
Avg: 0.036427 -> 0.035378: 1.03x faster
Significant (t=50.65)
Stddev: 0.00032 -> 0.00034: 1.0668x larger

### richards ###
Min: 0.174242 -> 0.163918: 1.06x faster
Avg: 0.175643 -> 0.165689: 1.06x faster
Significant (t=58.69)
Stddev: 0.00086 -> 0.00084: 1.0168x smaller

### simple_logging ###
Min: 0.300215 -> 0.287112: 1.05x faster
Avg: 0.301957 -> 0.288785: 1.05x faster
Significant (t=80.08)
Stddev: 0.00086 -> 0.00078: 1.1052x smaller

The following not significant results are hidden, use -v to show them:
django_v2, silent_logging, tornado_http.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22847>
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