[Jscheme-devel] (no subject)

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

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

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.  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.  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.

Regards,

Matthew Bilotti

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