RE: String interning (WAS: SAX2/Java: Towards a final form)
Tyler Baker wrote, > Miles Sabin wrote, > > [snip: table mapping to intern'd Strings] > > Even tho' this only requires one java-intern for each > > distinct name it still provides plenty of opportunities for > > synchronization collisions. > > Nope. Names in XML are highly redundant especially for > Namespace prefixes. Also, even if the number of calls to > String.intern() were significant (which they rarely if ever > are), modern Java runtimes have lowered synchronization > overhead to be small enough that you don't really have to > think about it much in terms of impacting performance > anymore. I think you're making two assumptions that don't always hold. Not all java xml applications are one shot, single doctype: some continuously parse multiple documents of a variety of doctypes in multiple threads. There's not necessarily _any_ particular upper bound on the number of distinct element and attribute names that might be encountered. So there could be continual contention for the JVM's intern table. And I think you're assuming a single processor JVM. The synchronization overhead picture is *very* different on multi- processors. Cheers, Miles -- Miles Sabin Cromwell Media Internet Systems Architect 5/6 Glenthorne Mews +44 (0)20 8817 4030 London, W6 0LJ, England msabin@c... http://www.cromwellmedia.com/ xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ or CD-ROM/ISBN 981-02-3594-1 Please note: New list subscriptions now closed in preparation for transfer to OASIS.
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