Re: Xerces vs Crimson performance

["Eric J. Schwarzenbach" <Er...@wrycan.com>]

This is late reply, but fwiw, have you tried turning on or off the feature
       
    http://apache.org/xml/features/dom/defer-node-expansion

The intention of the feature is to make parsing faster, but with certain
situations / document sizes it actually slows it down considerably. Or
at least it used to--I haven't played with it for a while so my data may
be old, but it's easy enough to try. Note that the default value of this
seems to depend on what implemention you use, so I would make sure to
try it explicitly set both ways.

Eric

Ritu Raj Tiwari wrote:

>Folks,
>I am migrating an application that makes use of
>validating XML parsing. It made use of the crimson
>parser and we are moving to xerces.
>
>The XML documents I encounter have a huge DTD they
>need to be validated against. On many occasions the
>documnents are actually much smaller than the DTD!
>Crimson had no way to cache grammars so the xerces
>grammar pool looked really exciting for performance
>gains.
>
>However, after enabling grammar caching, and running
>comparison with my codebase on JDK 1.4.2 + Crimson vs
>JDK 5 + Xerces,  I see negligible, if any, performance
>gain. I am looking at the total CPU time of the Java
>process as it runs through a suite of about 400 XML
>files. There is a lot going on apart from XML parsing,
>but Xerces vs Crimson (and the JDK) are the only major
>differences between the codebases.
>
>My questions are:
>- Are thre any obvious ways of boosting Xerces
>performance? In my application, all the documents make
>use of the same DTD.
>- I am currently on the xerces version that ships with
>JDK 5. Will moving to xerces 2.6.2 have any gains?
>
>Thanks.
>-Raj
>
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