[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

RE: String interning (WAS: SAX2/Java: Towards a final form)

  • From: Miles Sabin <msabin@c...>
  • To: xml-dev-digest@i...
  • Date: Wed, 12 Jan 2000 20:06:35 -0000

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.



PURCHASE STYLUS STUDIO ONLINE TODAY!

Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
Email
First Name
Last Name
Company
Subscribe in XML format
RSS 2.0
Atom 0.3
 

Stylus Studio has published XML-DEV in RSS and ATOM formats, enabling users to easily subcribe to the list from their preferred news reader application.


Stylus Studio Sponsored Links are added links designed to provide related and additional information to the visitors of this website. they were not included by the author in the initial post. To view the content without the Sponsor Links please click here.

Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.