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SubjectRe: Odd performance results
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On 10 July 2016 06:26:39 CEST, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
>Hello!
>
>So I ran a quick benchmark which showed stair-step results. I
>immediately
>thought "Ah, this is due to CPU 0 and 1, 2 and 3, 4 and 5, and 6 and 7
>being threads in a core." Then I thought "Wait, this is an x86!"
>Then I dumped out cpu*/topology/thread_siblings_list, getting the
>following:
>
> cpu0/topology/thread_siblings_list: 0-1
> cpu1/topology/thread_siblings_list: 0-1
> cpu2/topology/thread_siblings_list: 2-3
> cpu3/topology/thread_siblings_list: 2-3
> cpu4/topology/thread_siblings_list: 4-5
> cpu5/topology/thread_siblings_list: 4-5
> cpu6/topology/thread_siblings_list: 6-7
> cpu7/topology/thread_siblings_list: 6-7


I'm guessing this is an AMD bulldozer like machine?
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.

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