[Haskell-cafe] Is Haskell a Good Choice for Web Applications?
wren ng thornton
wren at freegeek.org
Thu May 7 00:06:10 EDT 2009
> Anton van Straaten wrote:
> > The app is written for a client under NDA, so a blog about it would have to
> > be annoyingly vague.
> > No doubt the potential for encountering space leaks goes up as one writes
> > less pure code, persist more things in memory, and depend on more libraries.
> Exactly. I'm worried about, e.g. needing to use something as simple as
> a stream of prime numbers (see the recent thread about leaks there)
The issues here are going to be the same in Haskell as in every other
language. There's always a tradeoff between the memory of caching old
results vs the time of recalculating them. At present no language's
RTS/GC is smart enough to make that tradeoff for you, and so memoization
must be done manually.
There are some tricks to help make this easier (e.g. weak pointers), but
the problem will always remain. The only thing that makes this perhaps
trickier than in other languages is that, AFAIK/R, the reflection API to
ask the RTS how it's feeling about memory at any given point isn't
terribly portable (between Haskell compilers) or polished/pretty. Then
again, the other GC languages I've dealt with aren't much better and are
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