Re: [xml-dev] XSLT with DOM or SAX ?

[Mukul Gandhi <mukul_gandhi@yahoo.com>]

I did a small performance comparison between Xalan-J
2.6.0 and Saxon 8.3 . I ran a simple identity
transform on a small XML file. 

The XSLT is -

<?xml version="1.0"?> 
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="1.0">
 
<xsl:output method="xml" indent="yes" /> 

<xsl:template match="@* | node()">
  <xsl:copy>
   <xsl:apply-templates select="@* | node()" />
  </xsl:copy> 
</xsl:template>
 
</xsl:stylesheet>


Average execution time recorded were:
-------------------------------------
Xalan-J 2.6.0 : 
with -DIAG option 220 ms

Saxon 8.3 : 
with -TP option 47 ms(Saxon's performance analysis
tool)
with -t option 63 ms

It seems Saxon is faster than Xalan. It seems upto
about 4-5 times.. I am assuming both Xalan and Saxon
are measuring the same things!

If "GNU JAXP XSLT processor" is 2.8 times faster than
Xalan , then Saxon is approximately 2 times faster
than GNU XSLT processor ..

I read in an article by Michael Kay that Saxon uses an
efficient tree structure suited for XPath data model..
DOM and XPath tree models don't map 100%. But I am not
sure what Xalan uses.. I guess it is DOM or a slight
variant of it..

Regards,
Mukul

--- Chris Burdess <dog@bluezoo.org> wrote:
> Michael Kay wrote:
> >> What kind of parser is best to use for XSLT
> transformations ?
> >> SAX or DOM
> >
> > XSLT processors will in general build a tree
> representation of the 
> > source
> > document in memory. And in general, many of them
> will build a tree
> > representation that is much more efficient than
> using a 
> > general-purpose DOM.
> > So there's no point building an inefficient DOM
> tree rather than 
> > letting the
> > XSLT processor build its own. But this advice may
> depend on the XSLT
> > processor you are using.
> 
> For what it's worth, the GNU JAXP XSLT processor
> uses DOM internally 
> for both source and result trees, and is about 2.8
> times as fast as 
> Xalan on a wide range of transformations (the OASIS
> XSLT/XPath 
> conformance suite). I don't have figures for memory
> usage or 
> comparisons with Saxon though.
> -- 
> Chris Burdess
> 
> 
>
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