Le 17/11/18 à 15:39, Kris Kuhlman a écrit :
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.
I tried your test script on Linux and everything works as expected
locally. So I guess the issue is specific to OS X, or to your own system.
Try using the --no-native option, as in 'pypy -m vmprof -o output.log
--no-native test.py'. That should disable most of the platform-specific
code, and it doesn't lose much information on pypy anyway.
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