Performance on amd64

[John Skaller]

        Can someone comment on the Debian package for Ubuntu Hoary
        providing ghc-6.2.2 with binary for amd64?
        
        I'm asking because I'm unexpectedly getting really bad 
        performance as you can see here:
        
        http://felix.sourceforge.net/current/speed/en_flx_perf_0005.html
        
        and here:
        
        http://felix.sourceforge.net/current/speed/en_flx_perf_0011.html
        
        These links are unstable, this one should always have
        the latest results:
        
        http://felix.sourceforge.net/current/speed/en_flx_perf.html
        
        The compilation is using:
        
        ghc -O3 -fvia-C -optc -O3 
        
        which can probably be tweaked, any advice on that appreciated.
        
        The actual test script measures real time performance
        by running programs at random.. there are lots of samples,
        the graphs are statistically reliable, and the randomness
        should eliminate most biases.
        
        For ackermann, the test is actually measuring how many
        words are required in the stack per call: the more the slower.
        
        For takfp, ghc is way behind, and Ocaml is actually way
        ahead since I think it uses doubles where the C based
        systems are using single precision (this affects the
        size of a stack frame) .. not sure about ghc, is Float
        a C float or a double in ghc?

I may try to build from source if this is expected to
provide better performance.

-- 
John Skaller <skaller at users dot sourceforge dot net>
Download Felix: http://felix.sf.net
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