Re: [xsl] measuring performance of XSLT stylesheet

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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