Subject: Java performance (Saxon) From: Kay Michael <Michael.Kay@xxxxxxx> Date: Tue, 29 Feb 2000 17:21:51 -0000 |
Slightly off-topic perhaps, for which I apologize, but I'm hoping someone can help me shed some light on some Java performance figures. I've been trying to make some performance improvements to Saxon, and have tested the results using both Microsoft Java SDK and SUN JDK 1.2, both on the same Win NT 4.0 box, with the following rather perplexing results (which are entirely repeatable). There are 5 stylesheets A to E, with execution times as follows, in seconds A B C D E Saxon 5.2, Sun 9.4 15.9 19.3 20.1 5.3 Saxon 5.2, MS 4.9 9.5 11.8 12.9 20.0 Saxon 5.3, Sun 7.3 12.3 18.4 18.0 5.8 Saxon 5.3, MS 3.1 5.2 19.0 10.8 19.8 All I can conclude from this is that there is a lot I don't know about the different Java VMs! Stylesheet A is running twice as fast on MS as on Sun, while Stylesheet E runs at barely a quarter of the speed. More worrying still, my "improvements" have caused a very healthy speed-up of A and B, on either VM, while on C they have made no difference on Sun but have made things a lot worse on Microsoft. I thought I'd share this, firstly to show the difficulty of doing any kind of performance comparisons even with one XSLT processor let alone between processors, and secondly in the hope that someone might be able to point me in the direction of resources that will help me understand what's going on. Any suggestions? Mike Kay XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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