[Python-Dev] 2.5a2 try/except slow-down: Convert to type? (original) (raw)

Michael Hudson mwh at python.net
Wed May 24 12:36:52 CEST 2006

Sean Reifschneider <jafo-python-dev at tummy.com> writes:

We're working at the sprint on tracking this down. I want to provide some history first and then what we're looking for feedback on.

Steve Holden found this on Sunday, the pybench try/except test shows a ~60% slowdown from 2.4.3 to 2.5a2. The original test is, roughly: for i in range(N): try: raise ValueError, 'something' except: pass But changing it to the following shows 0% slowdown from 2.4.3 to 2.5a2: e = ValueError('something') for i in range(N): try: raise e except: pass The change is that from 2.4.3 to 2.5a2 includes Brett Cannon's patch to make exceptions all new-style objects.

Could it just be that instantiating instances of new-style classes is slower than instantiating instances of old-style classes? There's not anything in what you've posted to suggest that exceptions are involved directly.

Cheers, mwh

-- Get out your salt shakers folks, this one's going to take more than one grain. -- Ator in an Ars Technica news item

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