half-baked parsers vs binary XML
David Megginson
david at megginson.com
Mon Mar 29 20:35:09 BST 1999
Gabe Beged-Dov writes:
> > The XML/SGML processing model is generally to walk through a document
> > (as a collection of events or as a tree) and fire off handlers for
> > different types of things. Even a short to medium-length XML document
> > can cause the handlers to be fired off many thousands of times, and if
> > you're trying to handle hundreds of requests per second, that's going
> > to cause problems with or without XML.
>
> Are we talking about throughput or responsiveness? It would be
> useful to bring up some use-cases where XML processing can't be
> employed using the default handler firing model and try to
> understand what the alternatives are.
I'm talking about throughput -- using a persistent interpreter (like
mod_perl) rather than a CGI can solve most of the responsiveness
problems.
The difficulty is just that firing off so much Perl code is (in Perl's
current design) slow. The original posting suggested using a binary
format because parsing XML with Expat is slow, but in fact, Expat and
the actual XML parsing turn out not to be a bottleneck.
All the best,
David
--
David Megginson david at megginson.com
http://www.megginson.com/
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