[antlr-interest] Re: Local lookahead depth

[lgcraymer]

--- In antlr-interest at yahoogroups.com, "Oliver Zeigermann" 
<oliver at z...> wrote:

> > > because of the memory issue. As a very practical exmaple I 
have 
> > parsing 
> > > of the AMM (Aircraft Maintenance Manual) which is available in 
> > SGML 
> > > (very hard to parse, really). I parsed this a few years using 
> > ANTLR, but 
> > > its size normally is around 100MB. A few years ago my machine 
had 
> > 128MB 
> > > of RAM! You see what I mean?
> > 
> > And how much disk space did you have?  On a UNIX box, mmap() is 
a 
> > good way of automating file I/O, but even on systems without 
virtual 
> > memory, you can fake it. Performance is not an issue--with a 
problem 
> > of this size, nothing stays in the processor cache, and the 
overhead 
> > of the disk writes will be only a few percent.
> > 
> > --Loring
> 
> 
> Loring,
> 
> are you really serious about this? Have a look at the DOM vs. SAX
> discussion in the XML area...

Of course.  Large memory machines are a recent luxury, and it is not 
hard to use disks efficiently.

--Loring

> Oliver


 

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