[issue28199] Compact dict resizing is doing too much work

[STINNER Victor]

STINNER Victor added the comment:

Oh, your message reminded me that I always wanted an option in the timeit module to run the benchmark on two Python versions and then directly compare the result. I just added the feature to perf and then I released perf 0.7.11, enjoy! The output is more compact and it's more reliable because the comparison ensures that the difference is significant.

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$ export PYTHONPATH=~/prog/GIT/perf
$ ./python-resize -m perf timeit --inherit-environ=PYTHONPATH --compare-to=./python-ref -s 'x = range(1000); d={}' 'for i in x: d[i]=i; del d[i];' --rigorous
python-ref: ........................................ 77.6 us +- 1.8 us
python-resize: ........................................ 74.8 us +- 1.9 us

Median +- std dev: [python-ref] 77.6 us +- 1.8 us -> [python-resize] 74.8 us +- 1.9 us: 1.04x faster
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I can reproduced the 4% speedup.

(I didn't review the patch yet.)

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nosy: +haypo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28199>
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