Mac::Carbon Profiling: Panther is Faster

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Boy howdy, is it. The system is an iBook G3/600 with 256MB RAM. The first test is with Mac OS X 10.2.8.

$ time perl -MMac::Glue -e 'Mac::Glue->new("Finder")->activate'
real    0m21.445s
user    0m7.100s
sys     0m0.510s
$ time perl -MMac::Carbon -e1
real    0m19.885s
user    0m6.810s
sys     0m0.220s

The second is Mac OS X 10.3.2.

$ time perl -MMac::Glue -e 'Mac::Glue->new("Finder")->activate'
real    0m2.067s
user    0m1.430s
sys     0m0.320s
$ time perl -MMac::Carbon -e1
real    0m1.300s
user    0m1.130s
sys     0m0.140s

Wow. That's pretty dramatic. More than 10x faster in real, and about 5x faster in user+sys. Why the speedup?

The slowest thing with Mac::Carbon was always in loading the modules on startup, with most of the time spent in dyld. Over 90% of that time in the Mac::Glue test in Mac OS X 10.2.8 was spent in dyld. In the Mac OS X 10.3.2 version it is still over 75%, but, obviously, much less time is spent there.

Before, it was spending over half of its time in link_library_module and add_reference combined, and about 20% in relocate_symbol_pointers/relocate_symbol_pointers_ in_library_image. Now, it still spends about 20% in the latter, but the former don't show up at all. And that 20% is a lot less than in the original, since the total time is so much shorter.

I don't know what all that means exactly, but I do know that yeeha, Panther is a lot faster at loading in them shared libraries.

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