Compiling a Stylesheet
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Compiling a Stylesheet
by robertsmme
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Michael,
what actually
happens when you compile a stylesheet?
does it
become an executable piece of code i.e. java Class(es)?
Martin
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Re: Compiling a Stylesheet
by Michael Kay
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Saxon-SA now has the ability to generate Java source code
from XQuery - this is then executed directly by the JVM (though of course it
needs Saxon as a runtime library.
But the (older) facility for "compiling" stylesheets is
rather different. It basically takes the optimized syntax tree produced by the
Saxon compile-time code and serializes it as a data structure on disk, so that
it can be reloaded and executed at any time. Frankly, there are no significant
performance advantages in doing this compared with recompiling the
source.
Michael Kay
http://www.saxonica.com/
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Re: Compiling a Stylesheet
by robertsmme
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From: saxon-help-bounces@... [mailto:saxon-help-bounces@...] On Behalf Of Michael Kay Sent: 22 July 2008 16:20 To: 'Mailing list for the SAXON XSLT and XQuery processor' Subject: Re: [saxon] Compiling a Stylesheet Saxon-SA now has the ability to generate Java source code
from XQuery - this is then executed directly by the JVM (though of course it
needs Saxon as a runtime library.
But the (older) facility for "compiling" stylesheets is
rather different. It basically takes the optimized syntax tree produced by the
Saxon compile-time code and serializes it as a data structure on disk, so that
it can be reloaded and executed at any time. Frankly, there are no significant
performance advantages in doing this compared with recompiling the
source.
Michael Kay
http://www.saxonica.com/
------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ saxon-help mailing list archived at http://saxon.markmail.org/ saxon-help@... https://lists.sourceforge.net/lists/listinfo/saxon-help |
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Re: Compiling a Stylesheet
by robertsmme
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Michael,
Does the java XQuery run much
quicker?
Martin From: saxon-help-bounces@... [mailto:saxon-help-bounces@...] On Behalf Of Michael Kay Sent: 22 July 2008 16:20 To: 'Mailing list for the SAXON XSLT and XQuery processor' Subject: Re: [saxon] Compiling a Stylesheet Saxon-SA now has the ability to generate Java source code
from XQuery - this is then executed directly by the JVM (though of course it
needs Saxon as a runtime library.
But the (older) facility for "compiling" stylesheets is
rather different. It basically takes the optimized syntax tree produced by the
Saxon compile-time code and serializes it as a data structure on disk, so that
it can be reloaded and executed at any time. Frankly, there are no significant
performance advantages in doing this compared with recompiling the
source.
Michael Kay
http://www.saxonica.com/
------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ saxon-help mailing list archived at http://saxon.markmail.org/ saxon-help@... https://lists.sourceforge.net/lists/listinfo/saxon-help |
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Re: Compiling a Stylesheet
by Michael Kay
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The Java XQuery code is typically 25%-50% faster than
running interpreted, but it can be anything from 0% to 80% depending on the
query. The biggest benefits seem to come when doing a lot of
arithmetic.
Michael Kay
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