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Re: importlib is now bootstrapped (and what that means)
 

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brett at python

Apr 16, 2012, 10:32 AM


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Re: importlib is now bootstrapped (and what that means) [In reply to]

On Mon, Apr 16, 2012 at 13:04, "Martin v. Löwis" <martin [at] v> wrote:

> > I don't see how depending on Cython is better than depending on having
> > an existing Python. If the only benefit is semi-readable code, surely
> > we do have source code for the pre-frozen module, and it is just a matter
> > of convincing hg that the bytecode is binary, not text?
>
> Cython-generated C code would likely be more stable (and produce
> compiler errors if it gets stale), whereas importlib.h needs to be
> regenerated with byte code changes.
>
> Having source code has the advantage that it becomes possible to
> single-step through the import process in C debugger. Single-stepping
> with pdb would, of course, be better than that, but I doubt it's
> feasible.
>
> In addition, there might be a performance gain with Cython over ceval.
>

The other benefit is maintainability. In order to hit my roughly 5% startup
speed I had to rewrite chunks of __import__() in C code and then delegate
to importlib's Python code in cases where sys.modules was not hit. Using
Cython would mean that can all go away and the differences between the C
and Python code would become (supposedly) non-existent, making tweaks
easier (e.g. when I made the change to hit sys.modules less when a loader
returned the desired module it was annoying to have to change importlib
*and* import.c).

Subject User Time
importlib is now bootstrapped (and what that means) brett at python Apr 14, 2012, 11:12 AM
    Re: importlib is now bootstrapped (and what that means) g.brandl at gmx Apr 14, 2012, 12:37 PM
        Re: importlib is now bootstrapped (and what that means) martin at v Apr 16, 2012, 7:07 AM
            Re: importlib is now bootstrapped (and what that means) brett at python Apr 16, 2012, 8:21 AM
            Re: importlib is now bootstrapped (and what that means) stefan_ml at behnel Apr 16, 2012, 12:17 PM
                Re: importlib is now bootstrapped (and what that means) amauryfa at gmail Apr 16, 2012, 1:43 PM
    Re: importlib is now bootstrapped (and what that means) stefan_ml at behnel Apr 16, 2012, 12:54 AM
        Re: importlib is now bootstrapped (and what that means) solipsis at pitrou Apr 16, 2012, 4:13 AM
            Re: importlib is now bootstrapped (and what that means) stefan_ml at behnel Apr 16, 2012, 4:49 AM
    Re: importlib is now bootstrapped (and what that means) rdmurray at bitdance Apr 16, 2012, 9:15 AM
        Re: importlib is now bootstrapped (and what that means) solipsis at pitrou Apr 16, 2012, 9:31 AM
            Re: importlib is now bootstrapped (and what that means) brett at python Apr 16, 2012, 9:40 AM
        Re: importlib is now bootstrapped (and what that means) martin at v Apr 16, 2012, 10:04 AM
            Re: importlib is now bootstrapped (and what that means) brett at python Apr 16, 2012, 10:32 AM
        Re: importlib is now bootstrapped (and what that means) g.brandl at gmx Apr 16, 2012, 4:11 PM
            Re: importlib is now bootstrapped (and what that means) solipsis at pitrou Apr 16, 2012, 5:27 PM
                Re: importlib is now bootstrapped (and what that means) brett at python Apr 16, 2012, 5:41 PM
                Re: importlib is now bootstrapped (and what that means) stefan_ml at behnel Apr 16, 2012, 10:12 PM
            Re: importlib is now bootstrapped (and what that means) rdmurray at bitdance Apr 17, 2012, 5:18 AM
    Re: importlib is now bootstrapped (and what that means) martin at v Apr 16, 2012, 10:08 AM
        Re: importlib is now bootstrapped (and what that means) brett at python Apr 16, 2012, 10:33 AM
    Re: importlib is now bootstrapped (and what that means) solipsis at pitrou Apr 16, 2012, 10:44 AM
        Re: importlib is now bootstrapped (and what that means) barry at python Apr 16, 2012, 10:51 AM
            Re: importlib is now bootstrapped (and what that means) rdmurray at bitdance Apr 16, 2012, 11:38 AM
        Re: importlib is now bootstrapped (and what that means) martin at v Apr 16, 2012, 2:12 PM
    Re: importlib is now bootstrapped (and what that means) ericsnowcurrently at gmail Apr 16, 2012, 10:45 AM
    Re: importlib is now bootstrapped (and what that means) stefan_ml at behnel Apr 16, 2012, 10:05 PM
    Re: importlib is now bootstrapped (and what that means) solipsis at pitrou Apr 17, 2012, 2:52 AM
        Re: importlib is now bootstrapped (and what that means) eric at trueblade Apr 17, 2012, 3:43 AM
            Re: importlib is now bootstrapped (and what that means) brett at python Apr 17, 2012, 8:41 AM
    Re: importlib is now bootstrapped (and what that means) solipsis at pitrou Apr 17, 2012, 10:39 AM
        Re: importlib is now bootstrapped (and what that means) brett at python Apr 17, 2012, 12:52 PM
    Re: importlib is now bootstrapped (and what that means) eric at trueblade Apr 20, 2012, 6:54 AM
        Re: importlib is now bootstrapped (and what that means) brett at python Apr 20, 2012, 7:59 AM
        Re: importlib is now bootstrapped (and what that means) ericsnowcurrently at gmail Apr 20, 2012, 8:02 AM
    Re: importlib is now bootstrapped (and what that means) brett at python Apr 20, 2012, 8:04 AM
    Re: importlib is now bootstrapped (and what that means) eric at trueblade Apr 20, 2012, 8:07 AM

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