iterator performance

[Christopher Wright]

<puts on asbestos suit ;)>

I'm finding a lot of cases where iterator performance in QC4 is dramatically worse than in QC3 (typically about half as fast).

Checkers.qtz
Description: application/quartzcomposer

(this does a 50x50 grid, with half the sprites disabled, so it's 2500/2 = 1250 sprites per frame -- MacBook can render this at 60fps in Leopard, MacBook Pro is struggling to hit 30fps in Snow Leopard.)

iteratorTest.qtz
Description: application/quartzcomposer

(this one's iteration count is cranked up really high, but it's still ~5fps on my MacBook 1.83GHzGMA950 running 10.5.8, and only 2.2-2.5fps on my MacBook Pro 2.4GHz 8600M GT running 10.6.x (the MacBook on Snow Leopard also hits about 2.5fps, so the same machine is half as fast in iterators). Turning down the iteration count makes it scale up, with 10.5 always running about 2x as fast as 10.6).

--
[ christopher wright ]
cwri...@kineme.net
http://kineme.net/

Is this expected? Does anyone else experience this kind of performance? Are there cases where iterators are actually faster (or at least as fast) on Snow Leopard? I'm only seeing a few cases where having all consumer subpatches get disabled causes snow leopard's iterator to skip work (unlike leopard's). Should I file a bug for this?

smime.p7s
Description: S/MIME cryptographic signature

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