[Beowulf] Woodcrest Memory bandwidth

Mark Hahn hahn at physics.mcmaster.ca
Mon Aug 14 15:04:24 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.

kinda sucks, doesn't it?  here's what I get for a not-new 
dual-275 with 8x1G PC3200 (I think):

Function      Rate (MB/s)   RMS time     Min time     Max time
Copy:        5714.6837       0.0840       0.0840       0.0841
Scale:       5821.0766       0.0825       0.0825       0.0826
Add:         6437.8226       0.1119       0.1118       0.1120
Triad:       6414.2079       0.1123       0.1123       0.1124
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