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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Validation vs performance - was Re: Fasttext out
 On Tue, 2004-04-20 at 12:45, Stephen D. Williams wrote: > David Megginson wrote: > > > Stephen D. Williams wrote: > > > >> Processing overhead, including the major components of parsing / > >> object creation / data copies / serialization, is not a 'future > >> problem'. It has always been a problem. > > > > We don't know how much and what kind of a problem XML will be until we've > > had time to gain experience -- if we try to optimize too early, we'll > > end up > > optimizing the wrong thing. > > I suppose "early" and "time to gain experience" are relative. > > > For example, I set up a test for a customer a while back to see how fast > > Expat could parse documents. On my 900 MHz Dell notebook, with 256MB RAM > > and Gnome, Mozilla, and XEmacs competing for memory and CPU, Expat could > > parse about 3,000 1K XML documents per second (if memory does not fail > > me). > > If I had tried to, say, build DOM trees from that, I expect that the > > number > > would have fallen into the double digits (in C++) or worse. In this > > case, > > obviously, there would be far more to be gained from optimizing the > > code on > > the other side of the parser (say, by implementing a reusable object > > pool or > > lazy tree building) than there would be from replacing XML with something > > that parsed faster. > > Why make the assumption that "optimizing the code on the other side of > the parser" is the first or only step? I posit that this is not the > best way to proceed and artificially narrows possible solutions. The > steps needed to parse XML, such as processing Expat events, cause a > minimum amount of work. When that data has been parsed, it must be in a > usable form and data in a usable form must be serialized at some point. that's a big claim. and i don't agree even a little bit. <snip/> 
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