Andrew I MacIntyre added the comment: My conclusions from the testing I've just reported: - there are some contradictory results which make little (obvious) sense, but the testing has been repeated a number of times and nearly all tests repeat to with 1%; - leave the int freelist as is, but move the compaction into gc.collect() as suggested by tiran in a python-dev posting; - keep the small int cache (it may profitably be increased to cover a wider range of ints, perhaps -256..1024?? - more testing required); - the float freelist and float LIFO, while being attractive in micro-benchmarks, are not useful enough to keep in large scale usage. This is especially the case when you consider that floats are much less prevalent than ints in a wide range of Python programs. Serious float users gravitate to Numpy and other extensions in most cases, and the simpler memory profile has its own attractions.
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