[Python-Dev] patch: speed up name access by up to 80% (original) (raw)

Neal Norwitz neal@metaslash.com
Mon, 11 Feb 2002 18:57:46 -0500

Oren Tirosh wrote:

On Mon, Feb 11, 2002 at 05:26:01PM -0500, Neal Norwitz wrote: > Oren Tirosh wrote: > > > > Problem: Python name lookup in dictionaries is relatively slow. > > > http://www.tothink.com/python/fastnames/fastnames.patch > > I tried this patch (*) by running the regression tests: > > make && time ./python -E -tt Lib/test/regrtest.py > > All the expected tests passed and there were no failures, this is good. > The bad news is that it was slower. It took 42 user seconds longer > with the patch than without. I have tried this and got the same results for the patched and unpatched versions (+-1 second). The regression tests spend most of their time on things like threads, sockets, signals, etc that have a lot of variance and are not really affected by name lookup speed.

I rebuilt everything from scratch and got results similar to Oren's, ie, roughly the same. This time I took off the test-coverage flags. (Sorry, I must have had them off for stock, but on with the Oren's patch).

Before patch:

real 2m57.416s user 1m12.830s sys 0m2.580s

After patch:

real 2m56.017s user 1m14.960s sys 0m2.380s

I still have inlines turned off.

Neal