> I think the performance difference is because of different versions of > NumPy. >
Good reason to leave numpy completely out of it. Unless you want to test nogil’s performance effects on numpy code — an interesting exercise in itself. Also — sorry I didn’t look at your code before, but you really want to keep the generation of large random arrays out of your benchmark if you can. I suspect that’s what’s changed in numpy versions. In any case, do time the random number generation… -CHB Python 3.9 installs NumPy 1.21.3 by default for "pip install numpy". I've > only built and packaged NumPy 1.19.4 for "nogil" Python. There are > substantial performance differences between the two NumPy builds for this > matmul script. > > With NumPy 1.19.4, I get practically the same results for both Python > 3.9.2 and "nogil" Python for "time python3 matmul.py 0 100000". > > I'll update the version of NumPy for "nogil" Python if I have some time > this week. > > Best, > Sam > > On Sun, Oct 31, 2021 at 5:46 PM Skip Montanaro <skip.montan...@gmail.com> > wrote: > >> > Remember that py stone is a terrible benchmark. >> >> I understand that. I was only using it as a spot check. I was surprised >> at how much slower my (threaded or unthreaded) matrix multiply was on nogil >> vs 3.9+. I went into it thinking I would see an improvement. The >> Performance section of Sam's design document starts: >> >> As mentioned above, the no-GIL proof-of-concept interpreter is about 10% >> faster than CPython 3.9 (and 3.10) on the pyperformance benchmark suite. >> >> >> so it didn't occur to me that I'd be looking at a slowdown, much less by >> as much as I'm seeing. >> >> Maybe I've somehow stumbled on some instruction mix for which the nogil >> VM is much worse than the stock VM. For now, I prefer to think I'm just >> doing something stupid. It certainly wouldn't be the first time. >> >> Skip >> >> P.S. I suppose I should have cc'd Sam when I first replied to this >> thread, but I'm doing so now. I figured my mistake would reveal itself >> early on. Sam, here's my first post about my little "project." >> https://mail.python.org/archives/list/python-dev@python.org/message/WBLU6PZ2RDPEMG3ZYBWSAXUGXCJNFG4A/ >> >> >> -- Christopher Barker, PhD (Chris) Python Language Consulting - Teaching - Scientific Software Development - Desktop GUI and Web Development - wxPython, numpy, scipy, Cython
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