OASIS Mailing List ArchivesView the OASIS mailing list archive below
or browse/search using MarkMail.


Help: OASIS Mailing Lists Help | MarkMail Help



   Re: XML Memory Requirements (was Re: Feeling good about SML)

[ Lists Home | Date Index | Thread Index ]
  • From: David Brownell <david-b@pacbell.net>
  • To: xml-dev@ic.ac.uk
  • Date: Thu, 18 Nov 1999 09:57:19 -0800

Tim Bray wrote:
> The performance is good enough that in Lark, the limiting factor was
> my lousy input buffering, not the character class checking; and Lark
> was always in the top half of the performance table. -Tim

I think that's pretty typical.  I've profiled several parsers by now,
and character class checking hasn't been a major issue ... usually
one or two percentage points CPU time for testing whether a character
works in a name (first/rest) or not.

The technique I used in Sun's parser may be good for many folk to steal.
It involves using the standard Character.getType() method (which has
access to lots of Unicode tables, and in recent JVMs uses native code
to quickly access them) and then filtering that output by the rules in
the XML spec.   

- Dave

xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@ic.ac.uk
Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1
To unsubscribe, mailto:majordomo@ic.ac.uk the following message;
unsubscribe xml-dev
To subscribe to the digests, mailto:majordomo@ic.ac.uk the following message;
subscribe xml-dev-digest
List coordinator, Henry Rzepa (mailto:rzepa@ic.ac.uk)


News | XML in Industry | Calendar | XML Registry
Marketplace | Resources | MyXML.org | Sponsors | Privacy Statement

Copyright 2001 XML.org. This site is hosted by OASIS