[plt-scheme] Typed-Scheme Memory Issues

From: Sam TH (samth at ccs.neu.edu)
Date: Tue Apr 7 15:51:30 EDT 2009

That's certainly quite a lot of memory use - and a lot of Typed Scheme code!

I don't know why it should take that much memory, but the one thing I
do recommend is compiling your files to byte code.  DrScheme does this
automatically in some cases, and you can do it manually with 'mzc -k'.
 Once the file is compiled, typechecking is complete, and subsequent
uses of that file should be much faster.  For example, if you have
files A.ss, B.ss and C.ss, each of which depends on the preceding,
then if you are changing C.ss a lot, then

% mzc -k A.ss B.ss

will likely improve your speed/memory issues.

If that doesn't help, let me know, and I'll try to see if there's
something in particular that's going wrong while typechecking your

sam th

On Tue, Apr 7, 2009 at 3:45 PM, Paulo J. Matos <pocmatos at gmail.com> wrote:
> Hi,
> I have been using typed-scheme for a bit now and my code base in typed
> scheme is now involving [only] 4 modules with a total of 3000 loc.
> Unfortunately, though things have been pretty slow for me lately since
> evaluating the main module of my project takes something in the order
> of minutes requesting over 2Gb of memory. Since I [only] have 2 Gb of
> memory, swapping starts and things get even slower.
> About this I don't know what to do but it needs to be improved. I have
> taken a few screenshots so you can check how the memory evolves while
> drscheme is interpreting a typed-scheme module [svn 14441]:
> Idle:
> Values http://users.ecs.soton.ac.uk/pocm06r/values_idle.png
> Graph http://users.ecs.soton.ac.uk/pocm06r/graph_idle.png
> On Load:
> Values http://users.ecs.soton.ac.uk/pocm06r/values_load.png
> Graph http://users.ecs.soton.ac.uk/pocm06r/graph_load.png
> Note that I have mostly nothing else running besides the gnome
> desktop... I sincerely don't know what to do. I hope this is just a
> bug regarding memory handling and can be easily fixed.
> If I can provide more info on this so it can be analyzed please let me know.
> Cheers,
> --
> Paulo Jorge Matos - pocmatos at gmail.com
> Webpage: http://www.personal.soton.ac.uk/pocm
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sam th
samth at ccs.neu.edu

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