Subject: Re: [xsl] measuring performance of XSLT stylesheet From: a kusa <akusa8@xxxxxxxxx> Date: Mon, 16 Nov 2009 14:23:37 -0600 |
Thank you so much for all your tips. Additionally, are there any particular tags that I must be avoiding to improve performance? I know using "//" is not advisable. Any other tags that I should be avoiding? On Mon, Nov 16, 2009 at 1:34 PM, Michael Kay <mike@xxxxxxxxxxxx> wrote: >> >> > Any tips on improving performance will also be helpful. >> >> To state the obvious, you should measure using the processor, >> stylesheet, and data that you will be using in real life. >> They will affect the outcome far more than will any >> generalisations that we can give. > > Tony has given the most important piece of advice without actually spelling > it out: concentrate on measuring and understanding the performance you are > getting, and the improvements will follow naturally. Never try to make > improvements until you have a measurement framework in place. Expect to > spend 90% of your effort on measuring performance and 10% on improving it. > > Some tips on measurement: > > (a) make sure you distinguish/discount Java VM warmup time, stylesheet > compilation time, document parsing/building time, transformation time, and > serialization time. Any or all of these components may be of importance to > you, but some of them can probably be discounted in production applications, > so you need to discount them in your measurements. > > (b) if you're going to measure Saxon from the command line, use the -t and > -repeat options, as well as -TP for profiling. > > (c) measure with different source document sizes and plot how performance > varies with document size. This tells you a lot about the performance > characteristics of your code. If the performance is quadratic, look for > expensive predicates and try to replace them with keys. > > (d) use metrics that relate to your performance requirements, so you know > when to declare success. > > Regards, > > Michael Kay > http://www.saxonica.com/ > http://twitter.com/michaelhkay
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