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vDSP Intel performance query
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vDSP Intel performance query


  • Subject: vDSP Intel performance query
  • From: Dave Malham <email@hidden>
  • Date: Tue, 27 May 2008 10:25:19 +0100

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

--
These are my own views and may or may not be shared by my employer
/*********************************************************************/
/* Dave Malham http://music.york.ac.uk/staff/research/dave_malham/ */
/* Music Research Centre */
/* Department of Music "http://music.york.ac.uk/"; */
/* The University of York Phone 01904 432448 */
/* Heslington Fax 01904 432450 */
/* York YO10 5DD */
/* UK 'Ambisonics - Component Imaging for Audio' */
/* "http://www.york.ac.uk/inst/mustech/3d_audio/"; */
/*********************************************************************/


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