[Haskell-cafe] Re: FPS: Finalizers not running (was Memoryusageoutside of the Haskell heap)

Sebastian Sylvan sebastian.sylvan at gmail.com
Tue Nov 8 11:39:40 EST 2005

On 11/8/05, Jan-Willem Maessen <jmaessen at alum.mit.edu> wrote:
> On Nov 7, 2005, at 9:02 AM, Bulat Ziganshin wrote:
> > ...Simon, can you please write some docs about all these foreign stuff
> > and their interaction with pure Haskell code? i see some bits of this
> > information in these newsgroups regularly (for example, are you
> > remember discussion about using lots of hashtables in program?), but
> > there is no definitive source
> Just wanted to let people know that I've been working on improving
> Data.HashTable, with the help of Ketil Malde's badly performing code
> and a bunch of locally-rolled tests.  Things are looking much better
> now, but will look better still when Simon M's GC fixes are more
> widely deployed (which ought to make the extant code perform much
> better).  I'm still not satisfied with any of the solutions, in part
> because I don't know whether they will also improve when I apply the
> GC fixes; if they don't ehy'll merely be on a par with the current
> library, and I only intend to release something which actually
> appears to work better in practice.
> That said, none of the HashTable problems had anything to do with
> foreign code.
> I've also created a QuickCheck suite for testing Data.HashTable.
> Very handy.  I don't know if there's a standard way to release
> testing code for extant libraries...

Request: Data.HashTable.Immutable

Really an immutable version should be standard (like for Array). Lots
of places where you use a Map could be improved by using a HashTable
instead (a lot of times you just fill it up once and then use it
exclusively for querying).


Sebastian Sylvan
UIN: 44640862

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