[Python-Dev] Python 2.4, VS 2005 & Profile Guided Optmization (original) (raw)

Joe Smith unknown_kev_cat at hotmail.com
Mon Jul 24 06:24:23 CEST 2006

"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".

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