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Re: vDSP Intel performance query
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Re: vDSP Intel performance query


  • Subject: Re: vDSP Intel performance query
  • From: Stephen Davis <email@hidden>
  • Date: Tue, 27 May 2008 09:00:05 -0700

In addition to the alignment question, can you specify exactly which vDSP routines you are using? It's unlikely but possible that you've picked one that hasn't been optimized for x86 yet.

What does Shark say?

stephen

On May 27, 2008, at 3:08 AM, tahome izwah wrote:

Not sure if this is helpful, but might this be an alignment issue?

--th

2008/5/27 Dave Malham <email@hidden>:
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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References: 
 >vDSP Intel performance query (From: Dave Malham <email@hidden>)
 >Re: vDSP Intel performance query (From: "tahome izwah" <email@hidden>)

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