[Haskell-cafe] I would like a clarification about Enumerators and Iteratees, please :)

Gregory Collins greg at gregorycollins.net
Tue Oct 16 14:53:34 CEST 2012

You have a space leak in "countCharBS". Put a bang pattern on your

On Tue, Oct 16, 2012 at 2:46 PM, Alfredo Di Napoli <
alfredo.dinapoli at gmail.com> wrote:

> Hi guys,
> I've started playing with Iteratee and Enumerators: very cool and
> addictive stuff.
> I have wrote this simple code:
> https://gist.github.com/3899017
> In a nutshell, it gives back the number of occurences for a single char in
> case the argument passed from the command line is a single char,
> or the number of lines of the entire file.
> I've tried it first on a small file (~100MB) and then on a huge one
> (~3GB). As far as I understood Iteratee IO should be a smart way to do IO,
> avoiding to keep the entire file in memory; what I observe in the second
> case, instead, is a sort of memory leak. The memory grows and grows
> until the entire machine hangs.
> If I split the huge file in "small" chunks, memory comsumption is still
> high but the computation terminates and is fast.
> So my two questions:
> a) What am I missing? Should be memory used be constant? And how can I
> achieve this purpose?
> b) I'm using the package enumerator because as far as I can see is the
> most used. How does it compares with "iteratee"? Which of the two are more
> performant?
> Bye and thanks,
> A.
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Gregory Collins <greg at gregorycollins.net>
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