vDSP Intel performance query
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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