On 06/20/2017 06:29 AM, Jay Pipes wrote:
On 06/19/2017 10:45 PM, Zhenyu Zheng wrote:
Sorry, The mail sent accidentally by mis-typing ...
My question is, what is the benefit of the above preference?
Hi Kevin!
I believe the benefit is so that the compute node prefers CPU topologies that do
not have hardware threads over CPU topologies that do include hardware threads.
I'm not sure exactly of the reason for this preference, but perhaps it is due to
assumptions that on some hardware, threads will compete for the same cache
resources as other siblings on a core whereas cores may have their own caches
(again, on some specific hardware).
Isn't the definition of hardware threads basically the fact that the sibling
threads share the resources of a single core?
Are there architectures that OpenStack runs on where hardware threads don't
compete for cache/TLB/execution units? (And if there are, then why are they
called threads and not cores?)
Chris
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