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about xml transform performance

we are now use apache's xalan for to process xml transform. but sometimes we should transform a big original xml file( about 1.4M), we get the test result is it need about more than 25 minutes to finish. but this is a web application and cant be acceptable. How could i improve the performance? and are there faster transformer?
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seasmile
Asked:
seasmile
1 Solution
 
edmund_mitchellCommented:
There are several faster transformers.
The most current current benchmarks are here:
http://www.datapower.com/XSLTMark/res_2001_03_28.html#ChartOverall

and another benchmark is here:

http://www.tfi-technology.com/xml/xslbench.html

Neither are as up-to-date as they could be, but they'll give you a pretty good idea as to how far behind Xalan is.
If you need a Java-based processor, I would really recommend you look into either Saxon[1] or xt (if you don't use certain features of XSLT)[2].  Of these two, Saxon is what I'd recommend, hands down.  

Note that sometimes you can rewrite your stylesheet to improve performance as well - one simple example:
If I want to select the <d> elements from this xml:
<a>
  <b>
    <c>
      <d></d>
    </c>
    <c2>
      <d></d>
    </c2>
    <c3>
       <d></d>
    </c3>
  </b>
</a>


I can write select="//d" but that will waste tons of processing time, because the processor checks absolutely everywhere for <d> elements.  Much better is to tell it where to go whenever you can:
select='a/b/*/d'
This is just a simple example, but hopefully it conveys the point.  There are many improvements to performance besides this that can be made from a stylesheet-authoring perspective - the use of keys, etc.  Mike Kays book "XSLT: A Programmer's reference (2nd ed.) has some good suggestions, and you can find others on the web, too.

HTH

Edmund

[1] http://saxon.sourceforge.net/
[2] http://www.jclark.com/xml/
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seasmileAuthor Commented:
Thank Edmund very much for your so detailed reply. I'll try the ways you told me. and of course I will give the points to you. thankx again.
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