[Haskell-beginners] Re: Memory usage problem

Sami Liedes sliedes at cc.hut.fi
Wed Mar 24 20:36:17 EDT 2010

On Wed, Mar 24, 2010 at 11:23:05AM +0100, Heinrich Apfelmus wrote:
> A quick fix would be to intersperse a function between  sort  and
> readRecords  that imposes proper evaluation order:
> While I expect the above to work, I hesitate to claim that it actually
> does. The reason is that I don't understand your  readRecords  function
> at a glance, unlike the  processFile  pipeline, it is not apparent how
> it works. Since finding and fixing space leaks is easier if your code is
> more obvious, I recommend to reformulate it as a function composition as
> well, for instance something like this:

Thanks, that was enlightening! With your version of readRecords the
program takes as much memory as with mine (it's still more than 10x
what the C version takes, but perhaps that's the cost of using
Haskell). But your version taught me a lot. Exactly the kind of
feedback I needed :)

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