[Beowulf] Woodcrest Memory bandwidth

Jason Holmes jholmes at psu.edu
Mon Aug 14 10:29:38 EDT 2006


Here's a 4 core Woodcrest system with 4 sticks of 2 GB 667 MHz FB-dimms:

Function     Rate (MB/s)  Avg time   Min time  Max time
Copy:       4813.2590      0.2663      0.2659      0.2675
Scale:      4826.2181      0.2656      0.2652      0.2662
Add:        5244.0135      0.3664      0.3661      0.3669
Triad:      5244.3106      0.3665      0.3661      0.3671

This was a pathscale compiled stream executable with openmp using 4 threads.

Thanks,

--
Jason Holmes


Bill Broadley wrote:
> I have a theory that the 533 MHz FB dimms have a severe performance
> penalty on 1333 MHz FSB.
> 
> Does anyone out there have a 1333 MHz FSB dual woodcrest (pick your
> vendor) with 4 667 MHz FB-dimms?  A 1066 MHz FSB with 4 533 MHz dimms
> would also be interesting.
> 
> Could you run: http://www.cs.virginia.edu/stream/ ?
> 
> Ideally compiled with a F90 or C compiler (Intel, Pathscale, and I imagine
> many others) that support OpenMP so you can run 4 threads (one per core)
> in parallel.
> 

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