Re: [Haskell-cafe] OCaml list sees abysmal Language Shootout results

28 Sep 2004

      On Tue, Sep 28, 2004 at 12:49:52PM +0200, Tomasz Zielonka wrote:
...
On Tue, Sep 28, 2004 at 12:01:11PM +0200, Tomasz Zielonka wrote:
...
On Tue, Sep 28, 2004 at 10:46:14AM +0100, Keith Wansbrough wrote:
...
I just saw this on the OCaml list (in a posting by "Rafael 'Dido' 
Sevilla"  in the "Observations on OCaml vs. Haskell" 
thread).  I can't believe that a simple "wc" implementation should be 
570 times slower in Haskell than OCaml - could someone investigate and 
fix the test?
No wonder it is so slow, this program looks as a result of some ,,as
slow as possible'' contest ;)
It took me half an hour to make a version which is 41 times faster
on a 5MB file. It should be possible to make it even 2-3 times faster
than this.
Changed readArray to unsafeRead, and it is 47 times faster now.

I must say I am pleasantly surprised that GHC managed to unbox
everything there was to unbox without much annotations. For 5MB file the
program allocated only 192KB in the heap. Especially optimisation of
higher-level constructs like 'fmap (toEnun . fromEnum) ...' is very
nice.

Code attached. Feel free to improve it.

Best regards,
Tom

-- 
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