Stack size

[Sigbjorn Finne]

Hi,

any chance of having a look at the code that's causing these
problems?

The only way to increase the Hugs control stack size is by
recompiling the sources, after having tweaked NUM_STACK
in prelude.h

The default C stack size on Win32 is 1MB, and you can change this
by re-linking with "/link /stack:<reserve>" added to the link line (this
is with MSVC tools & <reserve> being the size in bytes). 

hth
--sigbjorn

----- Original Message ----- 
From: "ajf" <ajf@doc.ic.ac.uk>
To: <hugs-bugs@haskell.org>
Sent: Thursday, September 13, 2001 03:48
Subject: Stack size


> 
> I'm using the Feb 2000 release of Hugs and am preparing student labs
> using the graphics library.  Several nasties happen:
> 
> *  For very moderate problems (plot ~2K lines centred in a window of
> fixed size) I get a control stack overflow.  To centre, the code finds
> pre-computes the minimum and maximum x and y ordinates of all line
> end-points.  This is potentially a problem, but fixable in this case,
> you'd hope.  However, the overflow happens EVEN IF the code is written
> tail-recursive, or using foldl.  Oh dear.
> 
> *  If the relevant scaling factors are passed as parameters (to avoid
> pre-computation) I can plot quite a bit more (4997 lines on my W2000
> set-up; rather more on an earlier installation under W98).  But then the
> program aborts, presumably because of the C stack overflow problem.
> 
> * On W2000 the previous problem corrupts the WHOLE screen buffer, rather
> like a virus.  Actually this is fixable by maximising and then
> minimising the hugs window, but it's all very disturbing!  On W98, the
> programs seems to die gracefully.
> 
> So question:  how do I increase the stack size?  Also, are you aware of
> problems with the graphics library burning up the C stack?  I cannot
> find anything in the hugs documentation, but have a feeling you have to
> recompile Hugs.  Is this true?
> 
> (Otherwise Hugs is completely wonderful...!)
> 
> Many thanks.
> 
> Tony Field
> Imperial College
> 
> 
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