[Haskell-cafe] hamming distance allocation

Arnoldo Muller arnoldomuller at gmail.com
Mon Apr 19 11:17:11 EDT 2010

The strings will not be longer than 30 characters.
I am doing sets of 2000  (total of 2000^2 distance computations)

I am expecting that all the operations will be lazyly performed but at some
point I get a memory error.

Most of the memory is being allocated for the hamming distance and I am
still unable to find the source of my memory leak.



On Mon, Apr 19, 2010 at 3:47 PM, Daniel Fischer <daniel.is.fischer at web.de>wrote:

> Am Montag 19 April 2010 14:37:33 schrieb John Lato:
> > Is it really necessary to use Strings?  I think a packed type, e.g.
> > Vector or ByteString, would be much more efficient here.
> Not very much if the strings are fairly short (and the list isn't too long,
> so there's not a big difference in cache-friendliness).
> If eight-bit characters aren't enough, packing the strings into
> UArray Int Char gives performance quite close to ByteStrings.
> > Of course this is only likely to be a benefit if you can move away from
> > String entirely.
> >
> > I suspect that "hamming2" would perform better then.
> >
> > John
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