Re: Performance in exec environnements

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From	Ian Kelly <ian.g.kelly@gmail.com>
Date	2015-01-14 10:11 -0700
Subject	Re: Performance in exec environnements
Newsgroups	comp.lang.python
Message-ID	<mailman.17730.1421255516.18130.python-list@python.org> (permalink)

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On Wed, Jan 14, 2015 at 2:02 AM, Jean-Baptiste Braun
<jbaptiste.braun@gmail.com> wrote:
> What I don't understand is the ratio between test 2 / 4 and test 1 / 3.
>
> Let 0.0229 sec be the execution time to read a bytecode (1st test).
> Executing two times that bytecode takes 0.042 sec (test 3), which looks
> coherent.
>
> Let 11.6 sec be the execution time to call the global exec, parse, do some
> stuff and read a bytecode (test 2). I'm trying to understand why does doing
> the same thing and reading one more bytecode is much longer (15.7 sec) in
> comparison.

You've also given it twice as much code to parse and compile.

C:\Users\Ian>python -m timeit "compile('1 + 1', '', 'exec')"
100000 loops, best of 3: 16.8 usec per loop

C:\Users\Ian>python -m timeit "compile('1 + 1; 1 + 1', '', 'exec')"
10000 loops, best of 3: 22.4 usec per loop

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Thread

Performance in exec environnements Jean-Baptiste Braun <jbaptiste.braun@gmail.com> - 2015-01-13 18:02 +0100
  Re: Performance in exec environnements Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-14 08:48 +1100
    Re: Performance in exec environnements Jean-Baptiste Braun <jbaptiste.braun@gmail.com> - 2015-01-14 10:02 +0100
      Re: Performance in exec environnements Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-15 12:51 +1100
    Re: Performance in exec environnements Chris Angelico <rosuav@gmail.com> - 2015-01-14 22:14 +1100
    Re: Performance in exec environnements Jean-Baptiste Braun <jbaptiste.braun@gmail.com> - 2015-01-14 14:38 +0100
    Re: Performance in exec environnements Chris Angelico <rosuav@gmail.com> - 2015-01-15 00:43 +1100
    Re: Performance in exec environnements Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-14 10:11 -0700

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