[Python-Dev] Python 2.4, VS 2005 & Profile Guided Optmization

[Joe Smith]

"Neil Hodgson" <nyamatongwe at gmail.com> wrote in message 
news:50862ebd0607232003gc800a48r3853bd773d3a7f21 at mail.gmail.com...
> Trent Nelson:
>
>> I ended up playing around with Profile Guided Optimization, running
>> ``python.exe pystones.py'' to collect call-graph data after
>> python.exe/Python24.dll had been instrumented, then recompiling with the
>> optimizations fed back in.
>
>   It'd be an idea to build a larger body of Python code to run the
> profiling pass on so it doesn't just optimize the sort of code in
> pystone which is not very representative. Could run the test suite as
> it would have good coverage but would hit exceptional cases too
> heavily. Other compilers (Intel?) support profile directed
> optimization so would also benefit from such a body of code.
>

GCC suppost profiling optimized code. One caveat is that the profile-enabled 
builds
ause a GPL'd library. Not a problem for Python right now as it is 
GPL-compatible,
but a caveat non-the-less.

That does not apply to the final optimized app. Anyway the flags used are: 
"-fprofile-generate"
and "-fprofile-use".