Re: [Python-Dev] try-except slower in 2.6 (was: performance)

[Antoine Pitrou]

M.-A. Lemburg  egenix.com> writes:
> 
> That's a huge slow-down compared to 2.5.
> 
> Are there any obvious reasons for this ? Has the exception handling
> mechanism changed that much between 2.5 and 2.6 ?

I've looked at it a bit and I think it's because of the
issubclass()/isinstance() slowdown (which itself is due to ABCs).

If I apply the patch in http://bugs.python.org/issue2534, the exception handling
slowdown seems to disappear.



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Re: [Python-Dev] try-except slower in 2.6 (was: performance)

[M.-A. Lemburg]

On 2008-08-24 21:04, Antoine Pitrou wrote:
>>>TryRaiseExcept:   183ms   122ms  +49.6%   184ms   124ms  
>>> +48.2%
>> Whoa, that's a big slowdown.  I wonder if it's consistent?
> 
> Yes, I can definitely reproduce it.

That's a huge slow-down compared to 2.5.

Are there any obvious reasons for this ? Has the exception handling
mechanism changed that much between 2.5 and 2.6 ?

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