[xsl] Re: why exsl:node-set() is so slow

["Dimitre Novatchev" <dnovatchev@xxxxxxxxx>]

"David Tolpin" <dvd@xxxxxxxxxxxxxx> wrote in message
news:200401161750.i0GHotfD005765@xxxxxxxxxxxxxxxxxxxxxx
> Hi,
>
> I wrote a chain of 4 stylesheets; the chain takes an XML file an produces
> another one through 4 transformations. It is reasonaly fast, with an XSLT
processor
> invoked from the command-line for each step (a shell script aids in it).
>
> Recently, I discovered exsl:node-set(), the function that takes the result
of
> one transformation and converts it to a node set, so that the
transformations
> can be chained within one invocation of the transformation engine, not
stepwise.
>
> I have gladly re-implemented the chain with use exsl:node-set() in hope
that
> time spent on the slow start-up of Java Machine will be saved. However,
all
> XSLT engines I have tested  have given me considerable lower performance
than
> with four invocation, 3 to 5 times slower. What's wrong with
exsl:node-set()?
>
> SAXON, for example, takes 150 seconds instead of apprx 50 to process the
same
> data

What data? It is missing from your zip file.

>  with calls to exsl:node-set() instead of command-line invocations of the
> same processor for each of the four steps. jd.xslt is even slower.
>
> The only notorious exception is xsltrpoc. It is much faster with
exsl:node-set()
> than without. The only drawback is that xsltproc produces absolutely wrong
and
> unusable result when exsl:node-set() is employed.
>
> What's wrong with exsl:node-set()?

Nothing -- did you test with MSXML4 ?


Dimitre Novatchev.
FXSL developer,

http://fxsl.sourceforge.net/ -- the home of FXSL
Resume: http://fxsl.sf.net/DNovatchev/Resume/Res.html




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