[Beowulf] Opinions of Hyper-threading?

Mattijs Janssens m.janssens at opencfd.co.uk
Thu Feb 28 13:09:12 EST 2008


How do your Rate numbers correlate to the max bandwitdh of 32GB/s 
(http://en.wikipedia.org/wiki/GeForce_8_Series)?

Or do these threads all operate on the same data?

Mattijs

On Thursday 28 February 2008 08:38, John Hearns wrote:
> On Wed, 2008-02-27 at 23:30 -0800, Bill Broadley wrote:
> > I don't see any particular reason why memory bandwidth can go through a
> > full doublings in the near future if there was a market for it, last I
> > checked nvidia was doing pretty well ;-)
> >
> > [1] Sorry to use marketing bandwidth, I've not seen stream numbers for
> > CUDA yet.  I hope to work on one though.  If anyone has numbers please
> > speak up.
>
> Some numbers here:
>
> http://forums.nvidia.com/index.php?showtopic=52686
>
>
> Running this on my 8600 card I get:
>
> STREAM Benchmark implementation in CUDA
>  Array size (single precision)=2000000
>  using 128 threads per block, 15625 blocks
> Function      Rate (MB/s)   Avg time     Min time     Max time
> Copy:      291777.6696       0.0001       0.0001       0.0001
> Scale:     291777.6696       0.0001       0.0001       0.0001
> Add:       437666.5043       0.0001       0.0001       0.0001
> Triad:     437666.5043       0.0001       0.0001       0.0001
>
>
> All the 0.0001 don't look right to me, but its 8:30 here and I should
> get on with the day job.
>
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