On Sat, 2008-04-05 at 13:41 +0200, Duncan Webb wrote:
> So the remaining question is, are SAX parsers much faster than DOM, if
> not then I propose that we replace all the xml parsers with ElementTree,
> then we could use code like:
The bundled sax parser is not only vastly faster than the dom parser,
but uses significantly less memory. Here is a paste from some analysis
I did last year, where I ran the parser through my TV.xml.
Parser Time [1] Peak Memory [2]
--------------- --------- -----------------
expat 4.4s 855 KB
sax 7.8s 2650 KB
minidom 1m42s [3] 590000 KB [3]
cElementTree 3.3s 119000 KB
libxml2 (SAX) 4.2s 24700 KB
libxml2 (DOM) 3.7s 123000 KB
[1] Average of 3 runs
[2] As reported by memprof
[3] Killed it before completion after it caused significant
thrashing
Based on this analysis, we're using xml.sax in kaa (especially epg), as
dischi said. minidom should absolutely be avoided, unless it's a
certainty that the XML is small, such as (as you pointed out) fxd files.
Based on the numbers I'm not sure there is a substantial benefit to
cElementTree over sax. The API is perhaps simpler.
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