[Beowulf] Re: dual core Opteron performance - re suse 9.3

[Stuart Midgley]

Actually, this statement isn't quite correct.  I have managed to  
increase the single-cpu stream number by turning interleaving to on.   
Streams is effectively getting the benefit of the other memory  
controllers.  This was very pominent on an HP DL585.  I was playing  
with the numa-tools and page placement quite a bit and it was very  
obvious that as I spread the memory across more numa-nodes the  
bandwidth went up.

Of course, your statement is true if you run a the streams benchmark  
on more than 1 cpus.

Stu.



>>
> The main practical result for dual-CPU single core Opteron server
> is: if I turn "Node interleaving" to ON, STREAM results will be  
> much more worse. Therefore some applications will work more slow.
>
> But what will be in the case of setting it to "AUTO" ? "Who"
> (and how) will solve about real setting ?
>
> Yours
> Mikhail
>


--
Dr Stuart Midgley
sdm900 at gmail.com


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