Re: [Jscheme-devel] stack overflow

[Timothy J. H. <ti...@cs...>]

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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