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

Mikhail Kuzminsky kus at free.net
Wed Jul 13 10:52:08 EDT 2005


In message from Joe Landman <landman at scalableinformatics.com> (Wed, 13 
Jul 2005 08:37:59 -0400):
>Hi John:
>
>   We find that we are talking about "per core" to our customers now. 
> I 
>explain that previously, there has been an implicit 1-to-1 mapping 
>between processor cores and chips, so that you could talk about 
>either one and mean the other.  Now however, we are talking about per 
>core, as things like licensing (lmgrd) aren't going to count chips or 
>sockets, but will count cores.
>
>   AMD uses the terminology of
>
>	Np processors / Mc cores
>
>so a dual Opteron 275 would look like
>
>	2p/4c
>
>system. 
I read some articles which used also MPU (Microprocessor Unit,
if I remember correctly) instead of CPU, 
i.e. MPU as equivalency to chip, and CPU as equivalence to core.

Mikhail
> I prefer the converse of this, 4c/2p, but thats just me.  I 
>don't know what (if any) terminology Intel uses for this.
>
>Per socket is the same as per chip.  The issue is the terminology may 
>not shift if you are talking about single core, dual core, quad core, 
>... N core.  From an end user perspective, the cores are real full 
>fledged CPUs that happen to share the same physical die as one or 
>more other cores.  That is, with a little though, the end user can 
>break the 1-to-1 mapping and talk in terms of cores, in which case 
>specifications start to make sense again.  1 GB per socket doesnt 
>make much sense if each core needs 1 GB for a particular calculation.
>
>Joe
>John Hearns wrote:
>> On Tue, 2005-07-12 at 21:00 -0700, Greg Lindahl wrote:
>> 
>>>On Tue, Jul 12, 2005 at 10:36:15AM -0500, Don Kinghorn wrote:
>>>
>>>
>>>>The dual-core system had 4 one GB modules arranged 2 for each cpu.
>>>
>>>To be anal-hyphen-retentive, don't you mean "2 for each socket"?
>>>
>> 
>> Acktcherly....
>> we do need to decide on a terminology here.
>> 
>> I recently did a response to a tender for a prospective customer.
>> I was tying myself in knots getting the correct terminology,
>> for questions such as "the systems MUST have xxx gigabytes of RAM 
>>per
>> processor"
>> I went with reading that as 'per socket' in the case of dual cores.
>> Also talking about 'dual nodes' is going to be more tricky.
>> 
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>
>-- 
>Joseph Landman, Ph.D
>Founder and CEO
>Scalable Informatics LLC,
>email: landman at scalableinformatics.com
>web  : http://www.scalableinformatics.com
>phone: +1 734 786 8423
>fax  : +1 734 786 8452
>cell : +1 734 612 4615
>
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