[Haskell-cafe] A tale of three shootout entries

[Sterling Clover]

Was this with tossing the partial sums code into the optimised bangs
program? Weird. I wonder if profiling will help explain why? In any case, If
nobody comes up with any other tweaks, I'll probably submit the optimised
bangs version to the shootout this weekend.

--S

On Nov 30, 2007 1:30 PM, Richard Kelsall <r.kelsall at millstream.com> wrote:

> Sterling Clover wrote:
> > I'm still curious if the pre-calculation of partial sums that I did
> > works well across processors, as I don't see why it shouldn't. My
> > less-strictified version of Don's code is attached, and below are the
> > functions you'll need to insert/replace to make the partial-sums
> > optimization work.
>
> Hello Sterling, I've timed your new Fasta with optimised bangs - it's
> the fastest so far. But the pre-calculated partial-sums version seems
> to go a bit slower for some unknown reason.
>
>                           Seconds
> Optimised bangs program    11.20    compiled ghc --make
> Optimised bangs program    10.73    compiled with -O -fglasgow-exts
>                                        -optc-mfpmath=sse -optc-msse2
>                                        -optc-march=pentium4
> Partial-sums program       11.97    compiled ghc --make
> Partial-sums program       11.14    compiled with -O -fglasgow-exts
>                                        -optc-mfpmath=sse -optc-msse2
>                                        -optc-march=pentium4
>
> This is on my GHC 6.6.1, W2K, Intel Core 2 Duo 2.33GHz machine - same
> as for the previous timings I gave in this thread.
>
>
> Richard.
>
>
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