[Python-Dev] Caching function pointers in type objects (original) (raw)

Collin Winter collinwinter at google.com
Wed Mar 3 23:34:44 CET 2010

Hey Daniel,

On Wed, Mar 3, 2010 at 1:24 PM, Daniel Stutzbach <daniel at stutzbachenterprises.com> wrote:

On Tue, Mar 2, 2010 at 9:06 PM, Reid Kleckner <rnk at mit.edu> wrote:

I don't think this will help you solve your problem, but one thing we've done in unladen swallow is to hack PyTypeModified to invalidate our own descriptor caches.  We may eventually want to extend that into a callback interface, but it probably will never be considered an API that outside code should depend on. Thanks Reid and Benjamin for the information. I think I see a way to dramatically speed up PyObjectRichCompareBool when comparing immutable, built-in, non-container objects (int, float, str, etc.).  It would speed up list.sort when the key is one of those types, as well as most operations on the ubiquitous dictionary with str keys.

That definitely sounds worth pursuing.

Is that a worthwhile avenue to pursue, or is it likely to be redundant with Unladen Swallow's optimizations?

I don't believe it will be redundant with the optimizations in Unladen Swallow.

If I can find time to pursue it, would it be best for me to implement it as a patch to Unladen Swallow, CPython trunk, or CPython py3k?

I would recommend patching py3k, with a backport to trunk.

Thanks, Collin Winter

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