I've been doing some more benchmarking using two homegrown CFD codes,
this time with Opterons and PPC-970s (G5).
Here is a typical single processor result :
Small memory code (110 MB): Time Opteron / Time G5 = 2.3
Opteron: 85 seconds
G5: 36 seconds
Large memory code (450MB) Time Opteron / Time G5 = 1.9
Opteron: 454 seconds
G5: 237 seconds
While the G5 is faster, the Opteron seems to have a better memory
access/bandwidth.
Also, I ran a job one job on the G5 using 1 processor and another
using 2 processors. The speed-up was only 50%. I did the same thing on
the Opteron and the speed-up was 83%!!!
I'm not sure what type of board the Opteron was built on but this is
very surprising as Apple was touting its motherboard as having the most
bandwidth. I think the performance is quite poor and I'm wondering its
worth getting 2 CPUs per board or just go with one?
Any ideas?
Thanks,
Sean
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