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RE: performance comparison

• To: "'zhengyu@a...'" <zhengyu@a...>, Xml-dev@l...
• Subject: RE: performance comparison
• From: "CHIUSANO, Joseph" <JCHIUSANO@l...>
• Date: Thu, 11 Jul 2002 19:43:54 -0400
• Return-receipt-to: "CHIUSANO, Joseph" <JCHIUSANO@l...>

Jimmy,

I'll provide some quick, basic feedback on #3 below ("why is DOM memory hungry") and defer to others to comment on the rest.  Unlike SAX, the DOM represents an entire XML document in memory in the form of a tree (called the "document tree").  SAX is an event-based API which does not need to build an internal tree.

From the site sax.sourceforge.net:

"Tree-based APIs are useful for a wide range of applications, but they normally put a great strain on system resources, especially if the document is large. Furthermore, many applications need to build their own strongly typed data structures rather than using a generic tree corresponding to an XML document. It is inefficient to build a tree of parse nodes, only to map it onto a new data structure and then discard the original."

"In both of those cases, an event-based API provides a simpler, lower-level access to an XML document: you can parse documents much larger than your available system memory, and you can construct your own data structures using your callback event handlers."

Hope that helps,
Joe Chiusano
LMI

> **************************************************************************
>   Joseph M. Chiusano
>   Logistics Management Institute
>   2000 Corporate Ridge
>   McLean, VA 22102
>   Email: jchiusano@l...
>   Tel: 571.633.7722
> **************************************************************************
>

-----Original Message-----
From: zhengyu@a... [mailto:zhengyu@a...]
Sent: Thursday, July 11, 2002 7:32 PM
To: Xml-dev@l...
Subject: performance comparison

Hello,

 I am evaluting various XML technologies right now.
Although I have used XML before, but in terms of
the real-world performance, I still need help.

  My questions are:

  1.  I have read numerous comparisons between SAX and
DOM, the test benchmarks mostly did straight comparisons
between the two, I think it is very misleading. Am I
right on this? DOM

  2.  Most people mention SAX can handle files larger
than memory, but I am thinking, is this really the case,
because files are read into the kernel buffer, so large
files still have to be read into the memory, just not in
user space. Am I right?

  3. DOM is memory-thirsty, according to most articles I
read. So DOM's performance lags, does anyone run any type
of profiling, and I am interested in why it is memory
hungry, and poor in terms of performance.

  4. What do people think of pull type parsers and DOM
SAX hybrids? Are these popular and stable?

  5. Is it possible for SAX to support XSLT?

Thanks

Jimmy

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