When building Python (and disutils based extensions) on Mac OS 
X, Python should ensure that the -single_module flag is being 
passed to the linker.

This will ensure that any given .so, .dylib, or framework is linked 
as a single module.   This will vastly reduce the startup times of 
python, reduce the load times of modules, and shave a bit of a 
performance hit off the top at runtime.

This should also be applicable to the modules built by distutils.

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[I'm closing 995023, because bbum filed first]

distutils extensions can not use -single_module because they are 
bundles, not dylibs.  Frameworks and dylibs are synonymous, of course.

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This is not applicable to the distutils modules as they are built now;  
only applicable to Python.framework (and like builds).

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Is this related to bug 799088?

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Not in the least.

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Could either of you come up with a patch? Also, how would I measure 
any improvement, "time python -c pass" or are there other things that 
are influenced as well?

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time python -c pass is probably sufficient..

I guess the patch is to line 114 of Makefile.pre.in.. should change from:

OTHER_LIBTOOL_OPT = -prebind -seg1addr 0x10000000

to

OTHER_LIBTOOL_OPT = -prebind -seg1addr 0xCFC00000 -single_module

Note I picked an arbitrary, probably unused, seg1addr.  0x10000000 is 
*NOT* correct!  It's in the Application Address Range!!!! See:
http://developer.apple.com/documentation/Performance/Conceptual/
LaunchTime/index.html

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Am I doing something wrong? I see absolutely no difference in runtime 
with this option: I get 0.15 seconds realtime (0.08 user time, system 
time variable) both with the new OTHER_LIBTOOL_OPT and without it.
(This is on a 933Mhz G4 iBook running 10.3.4).

I've been trying this with 2.4a1+.

What sort of speedups are you guys seeing?

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Is this still relevant?

Closing as this doesn't seem really useful anyway and nobody responded to 
my question if the issue is still relevant.