[Python-Dev] A wordcode-based Python

[Collin Winter]

On Tue, May 12, 2009 at 4:45 AM, Cesare Di Mauro
<cesare.dimauro at a-tono.com> wrote:
> Another note. Fredrik Johansson let me note just few minutes ago that I've
> compiled my sources without PGO optimizations enabled.
>
> That's because I used Visual Studio Express Edition.
>
> So another gain in performances can be obtained. :)

FWIW, Unladen Swallow experimented with gcc 4.4's FDO and got an
additional 10-30% (depending on the benchmark). The training load is
important, though: some training sets offered better performance than
others. I'd be interested in how MSVC's PGO compares to gcc's FDO in
terms of overall effectiveness. The results for gcc FDO with our
2009Q1 release are at the bottom of
http://code.google.com/p/unladen-swallow/wiki/Releases.

Collin Winter