[issue28866] Type cache is not correctly invalidated on a class defining mro()

[Julien Palard]

Julien Palard added the comment:

Hi,

Tried again, this  time getting some stats with MCACHE_STATS 1, to check if my patch is defeating the cache:

Without my patch:

$ time ./python performance/benchmarks/bm_chaos.py --worker -l1 -w0 -n1 --filename chaos.ppm --width=512 --height=512 --iterations 50000
chaos: Median: 2.51 sec
-- Method cache hits        = 16581735 (99%)
-- Method cache true misses = 4092 (0%)
-- Method cache collisions  = 28542 (0%)
-- Method cache size        = 96 KB

With my patch:

$ time ./python performance/benchmarks/bm_chaos.py --worker -l1 -w0 -n1 --filename chaos.ppm --width=512 --height=512 --iterations 50000
chaos: Median: 2.53 sec
-- Method cache hits        = 16582260 (99%)
-- Method cache true misses = 4096 (0%)
-- Method cache collisions  = 28012 (0%)
-- Method cache size        = 96 KB

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<http://bugs.python.org/issue28866>
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