Re: [xsl] XSLT 1 vs. 2 stylesheet performance issues

Subject: Re: [xsl] XSLT 1 vs. 2 stylesheet performance issues
From: "Ilya Sterin" <sterini@xxxxxxxxx>
Date: Wed, 30 Jul 2008 13:27:43 -0400
I'm not setting any keys.  Our xml structure is a cross reference
structure, but we haven't explicitly declared any keys.  But the same
is true when we run this through xslt 2.  Are you saying that xslt 1
was in need of explicit keys as opposed to xslt 2 processors?


On Wed, Jul 30, 2008 at 1:04 PM, Scott Trenda <Scott.Trenda@xxxxxxxx> wrote:
> What sort of keys are you setting on your input data in XSLT 1.0? I've
> found that any sort of keys dramatically increase the startup time as
> your input document gets very large. I'd imagine it's because the
> processor has to wait to start the processing until it's been able to
> give a key value to every node in the document.
> ~ Scott
> -----Original Message-----
> From: Ilya Sterin [mailto:sterini@xxxxxxxxx]
> Sent: Wednesday, July 30, 2008 11:38 AM
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: [xsl] XSLT 1 vs. 2 stylesheet performance issues
> I'm a bit stumped by the performance issues we're having.  We have an
> xslt 1 compliant stylesheet that takes 10 minutes to run in xslt 1
> processors (Saxon, Xalan, libxslt) and a few seconds in Saxon 9B.  I'm
> not sure what it can possibly be.
> We don't use anything out of the ordinary, we extensively use
> for-each, choose, and if.  But again, I'm not sure why it would take
> so much longer using an xslt 1 processor.  We need to utilize xslt 1
> processor for various reasons if possible.
> The processor seems to take most of the time in starting the
> transformation.  Using oxygen, the debugger says Starting
> transformation and stays there for about 10 minutes before
> transforming in a matter of seconds.  The same is true with using any
> of these processors in command line mode.
> Is there some performance documents available anywhere that outline
> how xslt 1 gets compiled and it's efficiencies/inefficiencies, how
> things are indexed, etc....?  I searched the web with no luck.
> Thanks.
> Ilya Sterin

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