[Haskell-cafe] Re: Haskell Speed

[Tomasz Zielonka]

On Sun, Dec 25, 2005 at 12:24:38PM +0100, Peter Simons wrote:
> Paul Moore writes:
> 
>  > It would be interesting to see standalone code for wcIOB
>  > (where you're allowed to assume that any helpers you
>  > need, like your block IO library, are available from the
>  > standard library). This would help in comparing the
>  > "obviousness" of the two approaches.
> 
> A simple version of the program -- which doesn't need any
> 3rd party modules to compile -- is attached below. My guess
> is that this approach to I/O is quite obvious, too, if you
> have experience with system programming in C.
> 
> IMHO, the main point of the example in the article is that
> 
>   wc :: String -> (Int, Int, Int)
>   wc file = ( length (lines file)
>             , length (words file)
>             , length file
>             )
> 
> is a crapy word-counting algorithm.

I have a crazy idea: what if we computed all three length applications
concurrently, with the RTS preempting the thread when it generates too
much unreclaimable nodes?

Do you know what I mean? The ideal effect would be that the three
threads chase each other on the list, there is always only a constant
part of the list in memory (no space-leak).

Best regards
Tomasz

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