Am 27.02.2013 23:24, schrieb Terry Reedy:
> On 2/27/2013 3:21 AM, jmfauth hijacked yet another thread:
>> Some are building, some are destroying.
>
> We are still waiting for you to help build a better 3.3+, instead of
> trying to 'destroy' it with mostly irrelevant cherry-picked benchmarks.
PEP 412 [1] causes a slow down in the dict instantiation code, see [2].
$ for PY in python2.7 python3.2 python3.3 ./python; do cmd="$PY -R -m
timeit -n 10000000 '{};{};{};{};{};{};{};{};{};{}'"; echo $cmd; eval
$cmd; done
python2.7 -R -m timeit -n 10000000 '{};{};{};{};{};{};{};{};{};{}'
10000000 loops, best of 3: 0.163 usec per loop
python3.2 -R -m timeit -n 10000000 '{};{};{};{};{};{};{};{};{};{}'
10000000 loops, best of 3: 0.139 usec per loop
python3.3 -R -m timeit -n 10000000 '{};{};{};{};{};{};{};{};{};{}'
10000000 loops, best of 3: 0.663 usec per loop
./python -R -m timeit -n 10000000 '{};{};{};{};{};{};{};{};{};{}'
10000000 loops, best of 3: 0.382 usec per loop
(./python is a patched 3.3 dev version)
Christian
[1] http://www.python.org/dev/peps/pep-0412/
[2] http://bugs.python.org/issue16465
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