[Python-Dev] Psyco testing results

2002年3月02日 00:51:36 -0500

Skip Montanaro wrote:
> Itamar> Basically, the key point is that you need to psyco.bind on the
> Itamar> right functions.
>> Sounds like a job for hotshot:
>> http://starship.python.net/crew/fdrake/talks/IPC10-HotShot-2002-Feb-06.ppt
> http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/python/python/dist/src/Lib/hotshot/

Not exactly. I tried binding functions hotshot said were using a lot of 
CPU time, and it didn't always help. But certainly hotshot helped 
finding which ones to try.
On the subject of hotshot - I made a command line hotshot profiler so 
you can use it easily, as with the standard profiler (download it from 
http://itamarst.org/software/). It's great! Unlike the standard profiler 
the results are much nearer to reality since the profiler isn't using 
half your CPU time.
Doing some testing, I noticed some results that were obviously wrong. A 
function that is listed as using 2 seconds of time, when a consequent 
run only said 0.003 or something. Since this was a function that 
basically did:
 if self.tasks:
 return 0.0
 else:
 return None
and it was run a similar number of times (and no threads), I suspect the 
 2 seconds result was totally bogus. Unfortanutely I didn't remember to 
keep the hotshot logs. This happened at least twice that I noticed.