How to understand "processor" in "SMP" and "UP"?

How to understand "processor" in "SMP" and "UP"?

[Nan Xiao]

Hi all,

Per my understanding, the "processor" in "SMP" and "UP" should be a "logic
CPU", not a "physical CPU".
If the "physical CPU" contains 2 "cores", and every "core" contains 2
"hardware threads", then the "processor"
should stands for "hardware thread".

Is my understanding right? Thanks very much in advance!

Best Regards
Nan Xiao
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How to understand "processor" in "SMP" and "UP"?

[Rik van Riel]

On 07/19/2015 11:43 PM, Nan Xiao wrote:
> Hi all,
> 
> Per my understanding, the "processor" in "SMP" and "UP" should be a
> "logic CPU", not a "physical CPU". 
> If the "physical CPU" contains 2 "cores", and every "core" contains 2
> "hardware threads", then the "processor"
> should stands for "hardware thread".
> 
> Is my understanding right? Thanks very much in advance!

Yes, you are absolutely right, when speaking from a
software point of view.

Each logical processor shows up as a CPU in Linux.

Of course, if you were to talk to somebody installing
physical CPUs in systems, you would get a different
answer :)

-- 
All rights reversed.

How to understand "processor" in "SMP" and "UP"?

[Nan Xiao]

Hi Rik,

Thanks very much for your comments!


Best Regards
Nan Xiao

On Tue, Jul 21, 2015 at 5:04 AM, Rik van Riel <riel@surriel.com> wrote:

> On 07/19/2015 11:43 PM, Nan Xiao wrote:
> > Hi all,
> >
> > Per my understanding, the "processor" in "SMP" and "UP" should be a
> > "logic CPU", not a "physical CPU".
> > If the "physical CPU" contains 2 "cores", and every "core" contains 2
> > "hardware threads", then the "processor"
> > should stands for "hardware thread".
> >
> > Is my understanding right? Thanks very much in advance!
>
> Yes, you are absolutely right, when speaking from a
> software point of view.
>
> Each logical processor shows up as a CPU in Linux.
>
> Of course, if you were to talk to somebody installing
> physical CPUs in systems, you would get a different
> answer :)
>
> --
> All rights reversed.
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
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