AW: Heap profiling in GHC broken?

Markus.Schnell at Markus.Schnell at
Tue Nov 4 14:26:02 EST 2003

I have no idea how to set up cvs under windows to get things 
from a non-local repository, but anyway, profiling worked on 
the macintosh.

I spent the whole weekend plus monday to find the space leak,
but eventually I did. 
Heap Profiling was very helpful there.

Unfortunately, space leaks are barely mentioned in the Haskell
books/tutorials, but they are a real burden if you want to run 
programs for larger problems.

A tutorial on this by one of the experts would be very welcome.


> -----Ursprüngliche Nachricht-----
> Von: haskell-cafe-bounces at 
> [mailto:haskell-cafe-bounces at] Im Auftrag von David Roundy
> Gesendet: Donnerstag, 30. Oktober 2003 13:48
> An: haskell-cafe at
> Betreff: Re: Heap profiling in GHC broken?
> On Wed, Oct 29, 2003 at 05:43:23PM +0100, 
> Markus.Schnell at wrote:
> > When I tried to profile my program in search for space leaks,
> > it core dumped on me (actually on Win2000/Cygwin). I'm 
> using ghc 6.0.1. 
> > Does anybody know what could be the problem?
> > 
> > (To be more precise: any +RTS -h_ options make problems, 
> +RTS -p works
> > fine.  I get a message meaning the equivalent of "statement in
> > '0x0058db43' points to memory in '0xfffffffc'. Could not read.")
> I believe this bug is fixed in CVS, so you could get it there 
> or wait for
> 6.2.  (I didn't fix it, I just reported it.)
> -- 
> David Roundy
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> Haskell-Cafe at

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