iPhone XML Performance Revisited

Ray Wenderlich has done a great comparison of iPhone XML parsers, using the same sample I had looked at earlier in the context of responsiveness.

 

As Ray was comparing performance, my hobby-horse, I was obviously curious as to how MAX stacked up against all the upstart competition. Quite well, as it turns out (average of 5 runs on an iPad with 3.2):

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Figure 1: total times (seconds)

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MAX was about 50% faster than the closest competition, TBXML, at 0.43s vs. 0.61s.

 

However, the XMLPerformance sample is a bit weird in that it measures elapsed time, not CPU time, and is multi-threaded, updating the display as results come in.

 

In order to account for this overhead that has nothing to do with the XML parsers, I added a "Dummy" parser that doesn't actually parse anything, but rather just generates dummy Song entries as quickly as possible. This takes around 0.2 seconds all by itself. Subtracting this non-XML overhead from the total times yields the following results:

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Figure 2: XML parse times (seconds)

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When measuring just the XML parsers themselves, MAX is around twice as fast as the closest competition and seven times as fast as the built in NSXMLParser.

 

Sweet.

[Update]  I forgot the link to where I had uploaded the source: XMLPerformance.tgz at http://www.metaobject.com/downloads/Objective-C/