Thorough Python 2.7.3 Windows Build Documentation?

Leonard, Arah Arah.Leonard at
Mon Jan 21 17:28:14 CET 2013

Hello again Python programmers,

	Final update on my Python 2.7.3 build issues.  After much insanity I finally used a process sniffer when running Python and tracked down that because of a path environment variable and the stupidity of Microsoft, Windows was loading another python27.dll rather than the one in the directory with the python.exe that I built, thus rendering my former tests useless.  Sorting this out using the .exe.local trick, I was able to re-test everything and come to reliable conclusions.  Based on performance results, it is without a doubt in my mind that the Python 2.7.3 precompiled binaries in the MSI are a PGO build.  I can now build my own binaries with the same performance as the released precompiled binaries.  And on my machine at least, these PGO built binaries do perform 30-36% faster than a normal release build.  Useful information if you're doing your own Python builds.  I'd still like to see Python start including some thorough build documentation on each release, but I'm certainly not going to be holding my breath on that.  ;)  Cheers.

Arah Leonard

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