On Tue, Sep 11, 2007 at 03:32:29AM +0000, [EMAIL PROTECTED] wrote: > So with all 8 cores at work from 2 sockets you are seeing 70% of peak assuming > you are using 667 MHz DDR2
I'm not sure what this word "peak" means -- it cannot be achieved by any test under any circumstances, whereas for a processor floating point peak, you can usually do it with some weird code. Much better to call the measured STREAM number the actual peak; then I won't have to let loose the memory bandwidth peak bot complainer once again ;-) > I thought first byte latencies were around 65 nanos for Opteron. Am > I confused? You're misremembering. Opteron latency was always a function of the number of active sockets, and it is usually measured with only one core active, while Bill is doing the more realistic thing of having all the cores active. Run the same code on your favorite Intel if you want to compare. -- greg _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
