[chuck-users] memory exhausted

[Gregory Brown]

Thanks, Tom. The YYMAXDEPTH hack gives a 'parser stack overflow'  
error on my machine. I'll work on slicing and dicing the code into  
more manageable chunks.

Thanks again for your time and suggestions,

  - Greg

On Apr 5, 2009, at 11:15 AM, Tom Lieber wrote:

> On Sun, Apr 5, 2009 at 10:37 AM, Gregory Brown <gwbrown at uga.edu>  
> wrote:
>> I have written a script that uses a rather data file to generate a  
>> chuck
>> file that is about 24000 lines long and 564KB. When I run the  
>> script I get a
>> "memory exhausted" error. Are there chuck-imposed limits that I am  
>> running
>> into? Is there a way to allocate more memory to chuck?
>>
>> I have tested this on two machines, both running OS X, ChucK  
>> 1.2.1.2, 2GB of
>> RAM. It does not seem to matter what other processes are running  
>> or how much
>> memory is available (real or virtual)… it always exits at the same  
>> line.
>> Also -- when I cut the file down to a few thousand lines, it runs  
>> fine.
>>
>> Any thoughts would be great. Thanks,
>
> This came up on the forum a while back:
> http://electro-music.com/forum/post-190157.html
>
> Boils down to inefficiencies in the way the ChucK grammar is parsed
> (right recursion instead of left). The method of solving the problem
> is introduced near the bottom of the thread -- rewriting the grammar
> -- although it's a little more complicated. ChucK likely uses the
> "wrong" type of recursion because that way a lot of things can be
> easily represented as singly-linked lists rather than doubly-linked.
>
> If the grammar file chuck.y is altered to use left recursion, all of
> the calls to prepend_*() functions defined in chuck_absyn.cpp need to
> be replaced with append_*() calls which do not currently exist.
>
> An afternoon's work, I think, if only I had an afternoon today. ;p
>
> It's just 8 functions that all need to be changed in the same way, and
> a find/replace on chuck.y, in case anyone else is up for it!
>
> P.S. There's also a hack mentioned on the forum thread that would
> allow you to rebuild your ChucK with a slightly higher tolerance for
> large files. If you're very near the limit, that might get you through
> this tough time.
>
> -- 
> Tom Lieber
> http://AllTom.com/
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