Re: [xml] Performance of DOM interface

[Daniel Veillard <veillard redhat com>]

On Sat, Aug 24, 2002 at 03:13:08PM +0200, wellnhofer aevum de wrote:
> Hi,
>
> I'm using libxml and libxslt with Perl to generate dynamic HTML pages 
> and did some performance testing recently. I created a XML tree from a 
> Perl data structure using the DOM interface and transform that tree with 
> XSLT.
>
> While the performance of the XSLT transformation is really good, I found 
> that constructing the DOM tree took about 75% of the running time. So it 
> takes about three times longer to create the XML source tree than to 
> parse a stylesheet and apply and output the transformation.
>
> Is this behavior normal? I would think creating an XML tree is much 
> faster than a XSLT transformation.

  Well usually when creating the input tree using directly the C parser,
the parse time (which includes building the DOM tree) is quite smaller than
the tranformation time itself. So no it's not "normal", though it also 
depends a lot on the stylesheet used too. You're probably paying the cost
of going back and forth between the Perl and the C library for each call 
to DOM entry points.

Daniel

-- 
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