Bristol Digest, Vol 585, Issue 5

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Today's Topics:

1. Processors (Martin Moore)
2. Re: Processors (D J Stewart)
3. Re: Processors (Tim Wintle)
4. Re: Processors (Keith Edmunds)
5. Re: Processors (Ashley Pittman)
6. Re: Processors (Zaniyah)


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Message: 1
Date: Thu, 15 Jan 2015 20:53:46 -0000
From: "Martin Moore" <martinm@it-helps.co.uk>
To: "'Bristol and Bath Linux User Group'" <bristol@mailman.lug.org.uk>
Subject: [bristol] Processors
Message-ID:
<!&!AAAAAAAAAAAYAAAAAAAAAFLxZtQqo65Oo+1jhlUB9DvCgAAAEAAAALHZmQqLYTlCq+0KrYYHAiIBAAAAAA==@it-helps.co.uk>

Content-Type: text/plain; charset="us-ascii"



I'm speccing some new servers and checking the existing ones they report 8
Xeon processors.



As far as I can find out, Xeon's have up to 4 cores - am I right in thinking
they have 2 physical 4 core processors?



Ta.

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Message: 2
Date: Thu, 15 Jan 2015 21:23:18 +0000 (GMT)
From: D J Stewart <bblug@iridium.org.uk>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] Processors
Message-ID: <alpine.DEB.2.11.1501152120480.19147@carbon>
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On Thu, 15 Jan 2015, Martin Moore wrote:

> As far as I can find out, Xeon?s have up to 4 cores ? am I right in thinking
> they have 2 physical 4 core processors?

What does /proc/cpuinfo say? You are interested mostly in the "cpu cores"
and "core id" fields.

--
Dave Stewart

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Message: 3
Date: Thu, 15 Jan 2015 21:38:06 +0000
From: Tim Wintle <timwintle@gmail.com>
To: martinm@it-helps.co.uk, Bristol and Bath Linux User Group
<bristol@mailman.lug.org.uk>
Subject: Re: [bristol] Processors
Message-ID:
<CAG1Xppw3_x1P=xFMfNgi2+qk+oRrzQoNkwdnz_OYr4P=MAY0EQ@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

4 physical cores with hyperthreading will often report as 8 cores FYI.

Tim

On Thu, 15 Jan 2015 20:54 Martin Moore <martinm@it-helps.co.uk> wrote:

> I?m speccing some new servers and checking the existing ones they report 8
> Xeon processors.
>
>
>
> As far as I can find out, Xeon?s have up to 4 cores ? am I right in
> thinking they have 2 physical 4 core processors?
>
>
>
> Ta.
> _______________________________________________
> Bristol mailing list
> Bristol@mailman.lug.org.uk
> https://mailman.lug.org.uk/mailman/listinfo/bristol
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Message: 4
Date: Thu, 15 Jan 2015 21:55:30 +0000
From: Keith Edmunds <kae@midnighthax.com>
To: bristol@mailman.lug.org.uk
Cc: martinm@it-helps.co.uk
Subject: Re: [bristol] Processors
Message-ID: <20150115215530.69f902a3@ws.the.cage>
Content-Type: text/plain; charset=US-ASCII

"lscpu" may help:

$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 2
Core(s) per socket: 2
Socket(s): 1
[...]

So above, there are 4 cpus, two threads per core and two cores per socket
(ie, one physical CPU chip).
--
"A champion is someone who gets up when he can't" - Jack Dempsey




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Message: 5
Date: Thu, 15 Jan 2015 22:03:12 +0000
From: Ashley Pittman <ashley@pittman.co.uk>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Cc: martinm@it-helps.co.uk
Subject: Re: [bristol] Processors
Message-ID: <1014E4AD-DB6A-455D-9AC6-59865CA2473F@pittman.co.uk>
Content-Type: text/plain; charset=us-ascii


Another great command for helping with things like this is lstopo, it can either give you a ascii art of graphical representation of the processes/RAM/caches etc in a machine.

Ashley.

> On 15 Jan 2015, at 21:55, Keith Edmunds <kae@midnighthax.com> wrote:
>
> "lscpu" may help:
>
> $ lscpu
> Architecture: x86_64
> CPU op-mode(s): 32-bit, 64-bit
> Byte Order: Little Endian
> CPU(s): 4
> On-line CPU(s) list: 0-3
> Thread(s) per core: 2
> Core(s) per socket: 2
> Socket(s): 1
> [...]
>
> So above, there are 4 cpus, two threads per core and two cores per socket
> (ie, one physical CPU chip).
> --
> "A champion is someone who gets up when he can't" - Jack Dempsey
>
>
> _______________________________________________
> Bristol mailing list
> Bristol@mailman.lug.org.uk
> https://mailman.lug.org.uk/mailman/listinfo/bristol




------------------------------

Message: 6
Date: Thu, 15 Jan 2015 22:08:11 +0000
From: Zaniyah <zan@zaniyah.org>
To: bristol@mailman.lug.org.uk
Subject: Re: [bristol] Processors
Message-ID: <54B83A4B.3090602@zaniyah.org>
Content-Type: text/plain; charset=windows-1252

On 15/01/15 21:23, D J Stewart wrote:
> On Thu, 15 Jan 2015, Martin Moore wrote:
>
>> As far as I can find out, Xeon?s have up to 4 cores ? am I right in
>> thinking
>> they have 2 physical 4 core processors?
>
> What does /proc/cpuinfo say? You are interested mostly in the "cpu
> cores" and "core id" fields.

Actually, Xeon is a marketing name and can refer to a lot of different
CPUs. The CPUs in our supercomputer are identified as Xeons, but they
have more than 4 cores.

More useful is if you know the actual family name (eg SandyBridge,
IvyBridge, Haswell, etc) then that will tell you a lot more. Better is
to know which model number you have, which you can get from
/proc/cpuinfo. It might be something like E7-8850V2 or E5-4603. Armed
with this you can go and look it up on ark.intel.com .



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