XOM API for Processing XML with Java

["Michael Kay" <mike AT saxonica.com>]

I agree that 4 bytes per node is a significant cost. I've been putting off
adding parent pointers to Saxon's TinyTree for that reason - it would help
significantly for wide trees (the typical RDBMS table dump of 100K records)
but that's not worth the increase from the current 29 bytes.

Michael Kay
http://www.saxonica.com/

> -----Original Message-----
> From: xom-interest-bounces AT lists.ibiblio.org 
> [mailto:xom-interest-bounces AT lists.ibiblio.org] On Behalf Of 
> Elliotte Harold
> Sent: 01 February 2005 01:06
> To: Wolfgang Hoschek
> Cc: xom-interest AT lists.ibiblio.org
> Subject: Re: [XOM-interest] indexOf O(1) patch?
> 
> 
> > The additional memory (4 bytes) required per Node doesn't hurt much 
> > either, considering how much memory is consumed by all 
> sorts of other 
> > info in node, element, text, etc. Perhaps Elliotte can 
> profile memory by 
> > parsing documents with java -verbose:gc and look at the 
> final max memory 
> > consumption.
> > 
> 
> I find it very hard to stomach four extra bytes per node. In my 
> experience memory consumption is a huge problem for XML 
> object models, 
> and prevents people from using XML far more often than speed 
> does. I've 
> done extensive profiling on memory usage, and worked very 
> hard to reduce 
> each class down to the bare minimum. I'm still not quite 
> there. They're 
> a couple of indirections I can pull out, especially in ParentNode and 
> Element, but mostly XOM is pretty small.
> 
> To convince me to spend four more bytes per node, the speed 
> increase is 
> going to have to be phenomenal, like a factor of ten on common 
> operations. I'm not going to be convinced by 30% on one 
> method. And even 
> then, I might push this off into a separate Ant target.
> 
> -- 
> Elliotte Rusty Harold  elharo AT metalab.unc.edu
> XML in a Nutshell 3rd Edition Just Published!
> http://www.cafeconleche.org/books/xian3/
> http://www.amazon.com/exec/obidos/ISBN=0596007647/cafeaulaitA/
> ref=nosim
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