On Sep 17, 2009, at 2:32 PM, Dave DeLong wrote:
For normal-sized directories, this works pretty well. However, in my "worst-case" scenario of a flat directory containing 1 million files, I've found that it takes 34.8 seconds to retrieve a full directory listing (so I know how many to return in browser:numberOfRowsInColumn:), 301.5 seconds to filter the array, and another 73.6 seconds to sort it.
Have you sampled/profiled it, so you know exactly what operations are slow? (My hunch is that, at that scale, high-level Cocoa conveniences like predicates and NSFileManager are going to add a lot of overhead.)
If you want have fast operations for huge directories, you'll need to use lower-level calls, unfortunately. The most efficient call for your purposes is probably getdirentriesattr. There's a good description of it, with sample code, in "Advanced Mac OS X Programming" (Dalrymple & Hillegass.)
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