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Re: XSLT with DOM or SAX ?

• To: "M. David Peterson" <m.david.x2x2x@g...>
• Subject: Re: XSLT with DOM or SAX ?
• From: Mukul Gandhi <mukul_gandhi@y...>
• Date: Mon, 28 Mar 2005 02:23:47 -0800 (PST)
• Cc: Chris Burdess <dog@b...>, Michael Kay <mike@s...>, xml-dev@l..., Razvan MIHAIU <mihaiu@m...>
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• In-reply-to: <f8da4eba0503280146235cab5c@m...>

Hi M. David,
  The execution time I reported is not for a single
transformation run. It is average of 5 runs. Every
single run varies slightly (by few milliseconds;
sometimes it is same).. So average needs to be taken.

I agree that my method will not say truly about the
performance characteristic of the processors. We need
to measure time over a wide range and size of
transforms.. 

I'll surely read the details on your site.

Regards,
Mukul

--- "M. David Peterson" <m.david.x2x2x@g...>
wrote:

> Hey Mukul,
> 
> As I have learned from creating similar tests and
> posting the results
> there are too many outside factors that go into
> these one off
> measurements to put any sort of weight on the
> result.  If interested,
> after I discovered the details of how to properly
> pressure cook a
> processor I created a quick little test suite that
> takes any given
> piece of XML, creates a range of file sizes
> (dynamically specified in
> the config file) and combines this with a structured
> series of
> commandline sequences to properly put a processor to
> the test in sets
> of 1, 3, and 9  iterations through the same XML
> file, outputting the
> results into seperate files that can then be used to
> develop a much
> more qualified understanding of what your dealing
> with...
> 
> I actually have several iterations of this original
> test-suite (it was
> a quick hack... its "grown-up" quite a bit since and
> I plan to release
> the new and improved version around the same time
> Saxon.NET goes from
> RC1 > RC2 > 1.0 Final in the next week or so) but
> for now if you want
> to play around with it you can access the file and a
> quick explanation
> of how it worls here >
>
http://www.xsltblog.com/archives/2004/12/next_portion_of.html
> 
> Have fun :D
> 
> <M:D/>
> 
> 
> On Mon, 28 Mar 2005 01:25:35 -0800 (PST), Mukul
> Gandhi
> <mukul_gandhi@y...> wrote:
> > 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@b...> 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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> 
> 
> -- 
> <M:D/>
> 
> :: M. David Peterson ::
> XML & XML Transformations, C#, .NET, and Functional
> Languages Specialist
> 



		
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