performance figures for xquery processorsMichael Kay mhk at mhk.me.uk
Tue Feb 7 17:17:22 PST 2006
> > Wonder, if any one has done performance testing on > > xquery processors that have java API and has some data > > to share with. > I can't add any data - comparative measures are only worth having if done by third parties, because any vendor can make their own product go faster than other people's - but I would make one or two observations. First, take care to separate query compilation time, document building time, and query execution time. Vendors make different trade-offs between these factors, because they are optimizing for different scenarios. Second, make sure that you run things for long enough to eliminate start-up overheads - Java takes a while to get up to speed. It's been suggested on this thread that the Saxon tree format takes more space than for example DTM. I would be surprised if there were a significant difference for most cases, so I'd be interested to see the evidence. However, it's good to see people discussing space as well as time: both are important (and savings in memory often translate into savings in time, especially when memory is short). Michael Kay http://www.saxonica.com/
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