[Haskell-cafe] Long running Haskell program
leimy2k at gmail.com
Wed Nov 11 14:33:45 EST 2009
On Wed, Nov 11, 2009 at 11:19 AM, Don Stewart <dons at galois.com> wrote:
> > I figured I was better off just creating a dependency in the evaluation,
> > the outermost portion of the program (the loop) that would cause a strict
> > evaluation, and so far I was right :-)
> > Program behaves very well now, and responds much better too.
> Do you know if Control.Monad.State.Strict is enough to get the behaviour
> you need?
I'll give that a go. Most of my trouble figuring out the space leak has
been around identifying what was really responsible for the problem. The
functions that were listed as eating the space in -hc runs were not
ultimately the ones causing the lack of strictness, in that they would have
had to have been evaluated at a higher layer in a non-lazy way.
So my take away from all of this is, when you have a space leak in haskell,
start from the outer most evaluations inward, not the other way around!!! I
think that would have saved me a ton of time.
> -- Don
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