[Pythonmac-SIG] MacPython 2.2.2 multiprocessor slowdown

[Neil Mayhew]

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on 05/11/2002 3:46 AM, Jack Jansen wrote:

> Maybe someone with a multiprocessor can try the timing script with both
> the carbon and the classic interpreter running under the classic
> environment?

Yikes! Look at these times (averaged over several runs):

Carbon-in-Classic (Carbon Python running in Classic)
21.23 $(PYTHON):Lib
 5.65 $(PYTHON):Mac:Lib
 4.56 $(PYTHON):Mac:Lib:lib-compat
 3.58 $(PYTHON):Lib:lib-dynload
 2.42 $(PYTHON):Extensions:img:Mac
 1.46 $(PYTHON)
 1.45 $(PYTHON):Lib:lib-tk
 1.39 $(PYTHON):
 1.31 $(PYTHON):lib:site-packages:Numeric
 0.94 :
 0.84 $(PYTHON):Extensions:Imaging
 0.74 $(PYTHON):Lib:site-packages
 0.71 $(PYTHON):Mac:Lib:lib-scriptpackages
 0.66 $(PYTHON):Extensions:img:Lib
46.93

The other results are as follows:

Classic-in-Classic (Classic Python running in Classic)
 0.07 $(PYTHON):Lib
 0.02 $(PYTHON):Mac:Lib:lib-compat
 0.02 $(PYTHON):Mac:Lib
 0.01 $(PYTHON):Extensions:img:Mac
 0.01 $(PYTHON):lib:site-packages:Numeric
 0.01 $(PYTHON)
 0.01 $(PYTHON):Lib:lib-dynload
 0.01 $(PYTHON):Lib:lib-tk
 0.00 $(PYTHON):Lib:site-packages
 0.00 $(PYTHON):Extensions:img:Lib
 0.00 $(PYTHON):Extensions:Imaging
 0.00 :
 0.00 $(PYTHON):Mac:Lib:lib-scriptpackages
 0.17

Carbon-in-X (Carbon Python running in X)
 1.46 $(PYTHON):Lib
 0.65 $(PYTHON):Mac:Lib
 0.60 $(PYTHON):Lib:lib-dynload
 0.30 $(PYTHON):
 0.07 $(PYTHON):Lib:lib-tk
 0.07 $(PYTHON):Mac:Lib:lib-compat
 0.06 $(PYTHON):Extensions:img:Mac
 0.05 $(PYTHON):Extensions:Imaging
 0.05 :
 0.01 $(PYTHON):Mac:Lib:lib-scriptpackages
 0.00 $(PYTHON):Lib:site-packages
 0.00 $(PYTHON):Extensions:img:Lib
 3.34

So the Classic-in-Classic results are pretty much as they should be.

However, I did notice that the Carbon-in-Classic times are greatly affected
by switching back and forth between PythonInterpreter and (eg) Finder during
the run, bringing them into line with the X-Carbon results, and sometimes a
good bit better.

Could this be due to PythonInterpreter running on the second processor, or
due to the different WaitNextEvent timeslicing that Mac OS 9 uses for
foreground and background processes?

One other tiny detail that I noticed: for Classic-in-Classic, sys.path[1],
which is the top-level Python directory, does not end in a colon, whereas
for the two Carbon ones it does.

In case anyone else wants to try these tests, I have attached my collation
script.

HTH,

--Neil

--
Neil Mayhew
Calgary, Alberta, Canada
niel_mayhew@mac.com

(Email address deliberately misspelled to foil spammers)


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