On 19/06/2007 17.13, Eyal Lotem wrote:
Hi, I have attached a patch at: https://sourceforge.net/tracker/?func=detail&atid=305470&aid=1739789&group_id=5470
A common optimization tip for Python code is to use locals rather than globals. This converts dictionary lookups of (interned) strings to tuple indexing. I have created a patch that achieves this speed benefit "automatically" for all globals and builtins, by adding a feature to dictobjects.
Additionally, the idea of this patch is that it puts down the necessary infrastructure to also allow virtually all attribute accesses to also be accelerated in the same way (with some extra work, of course).
I have already suggested this before but I got the impression that the spirit of the replies was "talk is cheap, show us the code/benchmarks". So I wrote some code.
Getting the changes to work was not easy, and required learning about the nuances of dictobject's, their re-entrancy issues, etc. These changes do slow down dictobjects, but it seems that this slowdown is more than offset by the speed increase of builtins/globals access.
How does it compare with this patch: https://sourceforge.net/tracker/?func=detail&atid=305470&aid=1616125&group_id=5470 ? -- Giovanni Bajo