[issue24375] Performance regression relative to 2.7
New submission from Yury Selivanov: Attached (t.py) is a random script that I stumbled upon pretty randomly on the internet -- someone used it to test different languages VMs performance. The interesting thing is that 2.7 runs it 20-30% faster than 3.4 3.5 consistently. The script does not involve any unicode data manipulation, it's mostly abount float arithmetic and function calls. -- components: Interpreter Core files: t.py messages: 244754 nosy: benjamin.peterson, haypo, ncoghlan, pitrou, yselivanov priority: normal severity: normal status: open title: Performance regression relative to 2.7 versions: Python 3.5, Python 3.6 Added file: http://bugs.python.org/file39609/t.py ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue24375 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue24375] Performance regression relative to 2.7
Stefan Krah added the comment: This is my experience, too: Floating-point calculations are often 20-30% faster on 2.7. -- nosy: +skrah ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue24375 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue24375] Performance regression relative to 2.7
Antoine Pitrou added the comment: FTR, Python 2.7 was slower until the computed gotos patch was backported. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue24375 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue24375] Performance regression relative to 2.7
Yury Selivanov added the comment: This is strange. On one of my gentoo boxes I'm having about the same performance of 2.7.9 and 3.4.3. On macos x, 2.7.10 is faster than 3.5.x (make distclean ./configure make). I don't know if I should close this issue. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue24375 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue24375] Performance regression relative to 2.7
Yury Selivanov added the comment: Alright. I'm closing it, as it seems it's not obvious what's really going on here. I'll try to profile it on my own later. (also, computing the Mandelbrot set using the CPython interpreter isn't a very good use case) Antoine, well, regardless of the actual task, we shouldn't have such cases (ideally). FWIW, using numba.jit gives a ~50x boost ;) -- resolution: - postponed status: open - closed type: - performance ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue24375 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue24375] Performance regression relative to 2.7
Antoine Pitrou added the comment: This is strange. On one of my gentoo boxes I'm having about the same performance of 2.7.9 and 3.4.3. As I said: the computed gotos patch improved performance between 2.7.9 and 2.7.10. In any case, if there's no obvious course of action you can suggest, I think it's better to close this issue. We don't want to keep an issue open for each performance regression in the wild. (also, computing the Mandelbrot set using the CPython interpreter isn't a very good use case) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue24375 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
