Inada Naoki <songofaca...@gmail.com> added the comment:
Microbenchmark for commit cf4f61ce50e07f7ccd3aef991647050c8da058f9.
# timeit -s 'd=dict.fromkeys(range(8))' -- 'dict(d)'
Mean +- std dev: [master] 311 ns +- 2 ns -> [patched] 144 ns +- 1 ns: 2.16x
faster (-54%)
# timeit -s 'd=dict.fromkeys(range(1000))' -- 'dict(d)'
Mean +- std dev: [master] 21.6 us +- 0.2 us -> [patched] 7.67 us +- 0.09 us:
2.81x faster (-64%)
# timeit -s 'd=dict.fromkeys(range(8))' -- '{}.update(d)'
Mean +- std dev: [master] 301 ns +- 5 ns -> [patched] 149 ns +- 1 ns: 2.01x
faster (-50%)
# timeit -s 'd=dict.fromkeys(range(1000))' -- '{}.update(d)'
Mean +- std dev: [master] 21.4 us +- 0.2 us -> [patched] 7.64 us +- 0.07 us:
2.80x faster (-64%)
----------
stage: patch review ->
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41431>
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