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.
---
$ 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
---
I can reproduced the 4% speedup.
(I didn't review the patch yet.)
----------
nosy: +haypo
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<http://bugs.python.org/issue28199>
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