[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: SAX, Java, and Namespaces (was Re: Restricted Namespaces for XML)
David Megginson wrote: > Tyler Baker writes: > > > As of JDK 1.1.6 things are not so bad and Java 2 is a bit better as > > interned Strings are under the hood managed using Weak References. > > It could be made better in the JDK though. I suspect if they made > > a real effort in the Java 2 JVM they could make string interns at > > least twice as fast as things currently are. Nevertheless, string > > interning is a one time cost so lets put that in perspective here. > > No, unfortunately it's much worse -- the parser has to re-intern > *every* element name and attribute name during the parse, so if I have > 6,000 attributes named 'foo', I have to invoke intern 6,000 times The implementation I have in an XML Parser I wrote only calls intern on strings which are not cached. I do this mostly to reduce calls to new String().intern(). It sure would of been nice if there was a static intern method in the String class that accepted a character array and used the contents to fetch an interned string (or else create a new one if the string is not present in the VM). > (just for those attributes). When I was writing AElfred, I got > something between a 10-30% speedup (I cannot remember the number) by > dropping Java's intern and writing my own. A bad intern is a killer > for an XML parser. Yah, it is really bad if you don't do any sort of String caching as well. Sorry to confuse you here with what I meant by interning strings... Tyler 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/ and on CD-ROM/ISBN 981-02-3594-1 To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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