[Beowulf] Re: Opteron 275 performance

Mark Hahn hahn at physics.mcmaster.ca
Fri Jul 29 10:29:27 EDT 2005


> > I find that most software has a pretty high flops-per-byte 
> > ratio, at least 
> > as compared to Stream/daxpy.  dual-core K8's seem like a 
> > pretty clear win,
> > though memory contention and higher single-core clocks can 
> > argue against.
> > (I'm about to receive 1536 single-core AMD's...)
> 
> But I also do understand why you did prefer the single cores :)

because I have apps which saturate a SC memory bus, of course!
recall that Amdahl's law still applies, so there are cases where 
1x2.6 GHz does better than 2x2.2 GHz, even without the memory issue.

and actually we're getting about 2K DC chips too, 
though not at the same site, thank goodness!

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