Re: vDSP Intel performance query
Re: vDSP Intel performance query
- Subject: Re: vDSP Intel performance query
- From: Eric Allamanche <email@hidden>
- Date: Tue, 27 May 2008 11:35:10 -0700
you should address your question to the macosx-performance list since
it's a better audience for this kind of questions.
Eric
On May 27, 2008, at 2:25 AM, Dave Malham wrote:
Hi,
Just been playing with the Accelerate framework and, in
particular, vDSP with a view to speeding up some of my Ambisonic
stuff. I have compiled the vDSP examples project and have gotten
results which I find a little odd and would appreciate some comments/
help from you gurus.
On my G4 1.33GHz iBook, I'm typically getting, for the first
2048x256 convolution in the example project, anything between 4 and
8 GFlops performance. However, on our quad core 2.66GHz Mac's in
our studios I'm only getting around 0.8 GFlops - and on my
colleague's Intel power book, this goes down to around 0.3 GFlops.
Both my iBook and the studio machines are running OSX 10.4.11, my
colleague's machine is running Leopard so it's not OS differences.
I've tried compiling natively (ie, not UB) on all machines (no
alterations to the XCode project as supplied) and then UB on all
machines, tried playing with optimisations, etc., etc., with little
effect - am I doing something wrong, or misinterpreting the results,
or is this an expecting result (it certainly wasn't expected by me...)
Regards
Dave
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