[racket] DrRacket never uses more than 1 GB?

I run DrRacket on Window 7 premium home and can go up to 2 Gb. (I have a
dual core 32 bit processor, 4 Gb memory of which 3 Gb for applications)
What amazes me is, that when setting memory unlimited, DrRacket can't go
over 2 Gb. In stead, when passing this limit, DrRacket is aborted by windows
7. (even when virtual memory limit of windows is set to 10 Gb)
Jos

> -----Original Message-----
> From: users-bounces at racket-lang.org 
> [mailto:users-bounces at racket-lang.org] On Behalf Of Greg Hendershott
> Sent: 13 July 2010 18:40
> To: Matthew Flatt
> Cc: plt-scheme
> Subject: Re: [racket] DrRacket never uses more than 1 GB?
> 
> Thanks Matthew. This was Racket 5.0. I swore "unlimited" was 
> set in DrRacket GUI. Maybe some bug where that was ignored?  
> I'll check again but meanwhile I reverted temporarily to PLT 
> Scheme 4.2.5. Another git bisect turned up a point where the 
> behavior changed (before that I wasn't running out of memory) 
> and I'm trying to figure out why. After I figure that out 
> I'll pop the stack and go back to Racket 5.0 to confirm 
> what's happening with that.
> 
> > I don't think that's it. If you have a memory limit set, 
> then there's 
> > a factor of 2 involved, but that doesn't apply when you 
> don't have a 
> > memory limit.
> 
> That's not what I'm seeing so far.
> 
> Again this is all on Windows 7 64-bit, in case that matters. 
> Since Racket (and PLT Scheme) are 32-bit processes, 2 GB is 
> the max they
> *could* get.
> 
> But they never get 2 GB. Just 1 GB. On both PLT 4.2.5 and 
> Racket 5.0, when I set "unlimited" in the GUI I have never, 
> ever seen the DrXxx.exe process exceed 1 GB.  It always tops 
> out there and GC kicks in. If GC can't free up much, it just 
> gets stuck "flatlined" there at
> 1 GB, and eventually the Visual C++ runtime error occurs.
> 
> So:
> [1] At some point my code started using much more memory. 
> That's my issue to figure out. Shouldn't need > 1 GB for this project.
> [2] Even so, 1 GB seems to be a limit even if "unlimited" is set.
> 
> On Tue, Jul 13, 2010 at 7:35 AM, Matthew Flatt 
> <mflatt at cs.utah.edu> wrote:
> > At Mon, 12 Jul 2010 16:55:17 -0400, Greg Hendershott wrote:
> >> Ah. If the GC needs 2X actual that would explain 2 GB --> 
> 1 GB usable.
> >> That's a shame but I understand.
> >
> > I don't think that's it. If you have a memory limit set, 
> then there's 
> > a factor of 2 involved, but that doesn't apply when you 
> don't have a 
> > memory limit.
> >
> >> Since I posted, my git bisect suggests it wasn't my code that 
> >> changed, instead there was some change from PLT 4 to Racket.
> >
> > For "Racket", do you mean version 5.0? If you mean later 
> versions from 
> > git, I wonder whether commit 41d1daf53 from June 1 is relevant. 
> > (Commit 0e664e7c0 is needed along with 41d1daf53 under Windows.)
> >
> >
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