Inada Naoki <songofaca...@gmail.com> added the comment:
I tried without PGO and confirmed performance improved on GCC 7.2.0.
No change on other compiler versions.
$ ./python -m pyperf timeit -s "import json; x = json.dumps({'k': '1' * 2 **
20})" "json.loads(x)"
old: 9211e2
new: 8a758f
gcc (Ubuntu 8.3.0-6ubuntu1) 8.3.0
old: Mean +- std dev: 721 us +- 0 us
new: Mean +- std dev: 722 us +- 0 us
gcc-7 (Ubuntu 7.4.0-8ubuntu1) 7.4.0
old: Mean +- std dev: 1.03 ms +- 0.00 ms
new: Mean +- std dev: 726 us +- 0 us
clang version 7.0.1-8 (tags/RELEASE_701/final)
old: Mean +- std dev: 721 us +- 1 us
new: Mean +- std dev: 722 us +- 0 us
clang version 8.0.0-3 (tags/RELEASE_800/final)
old: Mean +- std dev: 721 us +- 0 us
new: Mean +- std dev: 721 us +- 1 us
----------
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<https://bugs.python.org/issue37587>
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