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Fri Jun 20 17:44:40 CEST 2008 · https://mail.python.org/pipermail/python-dev/2008-June/080552.html

2008/6/20 Kevin Jacobs <jacobs at bioinformed.com> <bioinformed at gmail.com>:
> On Fri, Jun 20, 2008 at 10:25 AM, Antoine Pitrou <solipsis at pitrou.net>
> wrote:
>>
>> Kevin Jacobs <jacobs <at> bioinformed.com> <bioinformed <at> gmail.com>
>> writes:
>> >
>> > +1 on a C API for enabling and disabling GC.  I have several instances
>> > where
>> I create a large number of objects non-cyclic objects where I see huge GC
>> overhead (30+ seconds with gc enabled, 0.15 seconds when disabled).
>>
>> Could you try to post a stripped-down, self-contained example of such
>> behaviour?
>
> $ python -m timeit 'zip(*[range(1000000)]*5)'
> 10 loops, best of 3: 496 msec per loop
>
> $ python -m timeit -s 'import gc; gc.enable()' 'zip(*[range(1000000)]*5)'
> 10 loops, best of 3: 2.93 sec per loop

I remember that a similar issue was discussed some months ago:
http://bugs.python.org/issue2607

In short: the gc is tuned for typical usage. If your usage of python
is specific,
use gc.set_threshold and increase its values.

-- 
Amaury Forgeot d'Arc

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[Python-Dev] C API for gc.enable() and gc.disable()