How to enable profiling in Mac VM?
Fleeberz at aol.com
Fleeberz at aol.com
Sat Apr 28 20:57:46 UTC 2001
<snip questions about how to turn on profiling in Mac VM code>
On 2001-04-28 at 1:30:31 PM, johnmci at smalltalkconsulting.com replied:
>I'm not sure anyone has really explain this since it's tied to Code
>Warrior. If you build a Code Warrior project you must build it with
>CW profiling turned on in order to get the profile: to work.
(using CodeWarrior 6)
Uh, yeah. I guess I forgot to mention I'd done just that; OTOH I can't for
the life of me understand why the VM would slow down so drastically if
profiling _hadn't_ been turned on. I disassembled the code produced and sure
enough, there's stuff at function entry/exit points to read the real time
clock (cycle clock? whatever) in the PPC chip itself.
And speaking of _profile:_ itself, I guess if I'm stupid enough to try to
compile my own copy of the VM, it won't hurt to ask this of the group:
Could I please see working example code using _profile:_ (no underscores of
course) to profile, say, tinyBenchmarks?
Laugh at this at your leisure, but is it
SystemDictionary profile: [0 tinyBenchmarks]. "hit doIt (cmd-d) on this
line"
or what? Told you this would be a hairy problem! ;-)
>Also you should build the VM with no inlining. This makes it much
>easier to read the C code and to get proper profiling information.
If it's just a case of easier, I guess I'm okay... also, I generated the C
source at one other point when I specifically requested inlining where I
ended up with at least one source file in the 500 kilobyte range, FWIW, but
that's not what I'm currently working with. I can't seem to locate the simple
list of commands to issue to generate the sources anyway - saw them here I
think, but searching through the Squeak image previously showed enough to
compile a working VM - looking for an "official" list anyway, maybe someday?
>Apple also makes product that captures branch locations via hardware.
>With a .SYM file you can also get a good picture of where code usage
>is happening.
Sounds interesting. If I ever have any money I would consider looking into
that one.
Thanks in advance for any assistance,
Jean
P.S. If I ever write my own experimental version of the PPC jitter, may I
call it "Oil?"
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