Re: [Jscheme-devel] stack overflow

[Matthew W. B. <mbi...@ai...>]

Dear Timothy and Ken,

Thank you both so much for your prompt reply with suggestions; I'll try 
those as soon as I get a chance.

As of yesterday, I had rewritten the program to rely on as little JScheme 
as possible, converting most of the functionality in Java.  What I'm doing 
now is JS.load on initialization and a JS.call to run one Scheme function.  
I found that this error still occurs.  You are saying that the error 
message is not one of yours, but rather a VM message.  I had never seen it 
before prior to this experiment.  Let us see if we can gather some more 
information on this error and get back to you.

Thanks again!

~ Matthew

On Thu, 23 Oct 2003, Timothy John Hickey wrote:

> 
> On Wednesday, October 22, 2003, at 11:16 AM, Matthew W. Bilotti wrote:
> 
> > Dear JScheme developers,
> >
> > We were wondering what this error means.  It seems to come up after our
> > program has been doing what it is supposed to for awhile, and it is
> > accompanied by no other error message or Java exception.  We were 
> > hoping
> > you could shed some light on this:
> >
> > Fatal error allocating 12 bytesAborted
> Could you tell us what hardware/operating system/jvm you were using
> and anything else about the program that was running?
> >
> > Also, in a slightly related question, we were wondering if there is any
> > way to tell how deep we are recursing or what the limit is.  It seems 
> > as
> > if we blow the stack a lot like this:
> >
> >> java.lang.StackOverflowError
> >>         at 
> >> jsint.DynamicEnvironment.getValue(DynamicEnvironment.java:95)
> >>         at
> > jsint.DynamicVariable.getDynamicValue(DynamicVariable.java:13)
> >>         at jsint.Scheme.execute(Scheme.java:484)
> >>         at jsint.Scheme.execute(Scheme.java:514)
> >>         at jsint.Procedure.makeArgArray(Procedure.java:142)
> >>         at jsint.Scheme.execute(Scheme.java:521)
> >>         at jsint.Scheme.execute(Scheme.java:497)
> >> *       at jsint.Procedure.makeArgArray(Procedure.java:142)
> >> *       at jsint.Scheme.execute(Scheme.java:521)
> >
> > Where the two starred lines repeat over and over again a great many 
> > times.
> > Rewriting our procedure iteratively had no effect.
> Could you send us the offending program or procedure?
> >  I only got it to work
> > by rewriting it in Java.  I am sure there is no hidden infinite 
> > recursion
> > somewhere in our code because it works for a short input.
> It could be there is a non-infinite but still very large recursion. You 
> can
> reset the maximum Java stack depth by a command line argument
>     java -Xss40m jscheme.REPL
> which, I think, allows 40MB stack sizes for each thread...
> 
> See here for more details
> http://java.sun.com/j2se/1.4.2/docs/tooldocs/linux/java.html
> >  The code also
> > allocates a lot of data on the heap.  Is JScheme efficient with its 
> > memory
> > and garbage collection?  Do the heap and the stack share memory?  Could
> > this be the problem?  We are running with -Xmx1024m.
> >
> > Any insight you have would be greatly appreciated.
> Thanks for the feedback!!
> ---Tim---
> >
> > Regards,
> >
> > Matthew Bilotti
> >
> > -- 
> > matthew w. bilotti
> > artificial intelligence laboratory
> > massachusetts institute of technology
> >
> >
> >
> >
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> 
> 

-- 
matthew w. bilotti
artificial intelligence laboratory
massachusetts institute of technology