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- From: David Megginson <david@megginson.com>
- To: "xml-dev@ic.ac.uk" <xml-dev@ic.ac.uk>
- Date: Thu, 4 Feb 1999 19:35:50 -0500 (EST)
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
(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.
All the best,
David
--
David Megginson david@megginson.com
http://www.megginson.com/
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