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Re: Graphics card tricks



On Tue, 19 Oct 2004 8:24am, Holger Bettag wrote:
On Mon, 18 Oct 2004, Niall Dalton wrote:

 The proceedings and talks from the last ACM workshop on this topic
 makes for interesting reading.

 > http://www.cs.unc.edu/Events/Conferences/GP2/program.shtml

I could be mistaken, but it seems to me that in all direct performance
comparisons between GPU and CPU, vectorized CPU programs are conspiciously
absent.


If you do go to the length to write hardware specific programs for the GPU
to gain, say, a factor of four speed improvement, then you can as well
write hardware specific AltiVec ('velocity engine') code to gain pretty
much equivalent amounts of performance.

GPUs generally offer scatter/gather capabilities for texture lookups. I think you'll find that proper use of that facility allows GPUs to easily outpace an equivalent CPU vector program, even with the clock speed difference.
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| Alexander M. Rosenberg <mailto:email@hidden> |
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References: 
 >Graphics card tricks (From: "Edward K. Chew" <email@hidden>)
 >Re: Graphics card tricks (From: Holger Bettag <email@hidden>)



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