Mailman 3 November 2018 - pypy-dev

save the date: PyPy Sprint in Düsseldorf February 4-9, 2019
by Carl Friedrich Bolz-Tereick 26 Jan '19

26 Jan '19

Hi all, I'll do a more proper sprint announcement soon, but to give some advance warning, I am organizing a PyPy sprint at the Heinrich-Heine-Universität Düsseldorf from February 4-9, 2019 (both days inclusive). The last sprint we had there was in 2010 :-). Cheers, Carl Friedrich

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Slowdown on latest 3.5 nightly?
by Donald Stufft 23 Nov '18

23 Nov '18

I’ve been working on porting PyPI/Warehouse to using PyPy3, using the latest PyPy3 release (6.0.0) my tests on Warehouse take ~200 seconds to run, which is roughly within the realm of what I expected. I noticed when I tried to use the latest PyPy3 3.5 nightly (pypy-c-jit-95315-0a5cd8d36e99-linux64.tar.bz2) that my tests were randomly “hanging” (or taking so long to complete a single test that I got bored and filled it). It wasn’t every time, (IOW, the test it happened to would switch around each run). I thought maybe it was a problem with the functional tests, and ran only the unit tests, and it got ~19% of the way through and happened again (and in general the tests were way way slower). I went back one nightly release, to pypy-c-jit-95312-3bb86a88e1d3-linux64.tar.bz2 and tried with that, and that works as expected, with a similar runtime to PyPy3-6.0.0 and without any hangs.

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pypy, vmprof and mpmath
by Kris Kuhlman 20 Nov '18

20 Nov '18

I am using pypy to run numerical integration calculations with the arbitrary precision library mpmath (http://mpmath.org). I am using pypy2-v6.0.0-osx64 and version 1.0 of mpmath (from github). I install mpmath with pypy and use the native (python only) version; I am not using the gmp backend. I have noticed that sometimes seemingly small changes in my scripts result in big changes in runtime with pypy, and I was wondering if there were some jit options or settings I could change to improve things. Following advice from the pypy website, I tried using vmprof to profile one of my scripts. I installed vmprof into pypy using pip, starting with "pypy -m ensurepip". First I tried to run one of my scripts with vmprof, which typically take <10 minutes to run, but it ran for a few hours and so I eventually killed it (it doesn't respond to ^C, so I have to put it into the background and kill it explicitly with the kill command). Then I tried just a small test script like the following: cat -> test.py import mpmath as mp print mp.pi ^D This runs fine from pypy as: $pypy test.py >3.14159265358979 but running this same script using vmprof and pypy as pypy -m vmprof -o output.log test.py uses 4GB of ram, 100% processor, and if left running will generate a output.log file of growing size (so I kill it). If I run the following: cat -> test2.py x = 3.14159 print x ^D vmprof runs quickly and generates a small output.log file (~400kb). As an aside, if I try to use the --web option, it hangs on "Uploading to http://vmprof.com..." If I try to go to this website in my browser there is an error page about bad gateway from Cloudflare. I seem to be able to use mpmath with pypy just fine, but the combination of pypy, mpmath, and vmprof seems to not work. Any suggestions? I am not an experienced vmprof user. Kris

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