Funnily enough, I have managed to get generative mesh stuff working with an Iterator and OpenCL, with different coloured mesh per-Mesh Renderer instance. It's not as fast as I would like, but since it uses OpenCL, there's not way to compare with QC 3.
a|x
--- On Wed, 4/11/09, George Toledo <email@hidden> wrote:
> From: George Toledo <email@hidden>
> Subject: Re: iterator performance
> To: "Christopher Wright" <email@hidden>
> Cc: "quartzcomposer-dev list list" <email@hidden>
> Date: Wednesday, 4 November, 2009, 20:12
> I'm getting the same basic fps results
> using the same hardware to test both qtz's - performance
> is pretty much halved in SL (as in, half as fast). I could
> post more examples, but you've covered it.
>
> I haven't found any scenarios where the new
> iterator is quicker, and the iterator also always seems to
> be a problem patch in scenarios where other things break,
> though it may just be coincidence.
>
> Off the top of my head, iterator+shadows are a no-go,
> iterator + mesh creator results in the color values from the
> mesh creator getting broken (still need to file bug
> officially), and a particular queue+iterator thing that
> worked for me in 10.5 no longer works. This could all be
> side issues to this performance problem, but when taken
> together, it makes me dubious about the new iterator, in
> general.
>
> -George Toledo
>
> On Wed, Nov 4, 2009 at 2:48 PM,
> Christopher Wright <email@hidden>
> wrote:
>
> <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).
>
>
>
>
> (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.)
>
>
>
>
> (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).
>
>
>
>
> 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?
>
>
>
>
> --
>
> [ christopher wright ]
>
> email@hidden
>
> http://kineme.net/
>
>
>
>
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