[Python-ideas] Python 3000 TIOBE -3%

[Guido van Rossum]

Please do file an upstream bug for this.

On Thu, Feb 9, 2012 at 11:23 AM, Sturla Molden <sturla at molden.no> wrote:

> On 09.02.2012 20:05, Guido van Rossum wrote:
>
>  I'm curious about the module loader problem. Did someone ever analyze
>> the cause and come up with a fix? Is it the import lock? Maybe it's
>> something for the bug tracker.
>>
>
> See this:
>
> http://mail.scipy.org/**pipermail/numpy-discussion/**
> 2012-January/059801.html<http://mail.scipy.org/pipermail/numpy-discussion/2012-January/059801.html>
>
> The offender is actually imp.find_module, which results in huge number of
> failed open() calls when used concurrently from many processes.
>
> So a solution is to have one process locate the modules and then broadcast
> their location to the other processes.
>
> There is even a paper on the issue. Here they suggest importing from
> ramdisk might work on IBM blue gene, but not on Cray.
>
> http://www.cs.uoregon.edu/**Research/paracomp/papers/**
> iccs11/iccs_paper_final.pdf<http://www.cs.uoregon.edu/Research/paracomp/papers/iccs11/iccs_paper_final.pdf>
>
> Another solution might be to use sys.meta_path to bypass imp.find_module:
>
> http://mail.scipy.org/**pipermail/numpy-discussion/**
> 2012-January/059813.html<http://mail.scipy.org/pipermail/numpy-discussion/2012-January/059813.html>
>
> The best solution would of course be to fix imp.find_module so it scales
> properly.
>
>
> Sturla
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>



-- 
--Guido van Rossum (python.org/~guido)
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