On Tue, 21 Aug 2007, Young, Charles C. wrote:
> The 15% edge over Opteron is for running one job, right? When using all
> 8 cores, that becomes roughly 1/2 or 7.5%. The yakut number is for one
> job, but there are probably other loads. So it's not clear which number
> is more relevant.
Well, the yakut was busy I used so you can't compare the Wall Time. The
15% edge I expected to be reduced by the 5% loss, so down to 10%. I should
try a multicore Opteron and repeat multiple jobs there. Can I have one of
the new-ish machines to do that?
> --
> Charles C. Young
> M.S. 43, Stanford Linear Accelerator Center
> P.O. Box 20450
> Stanford, CA 94309
> [log in to unmask]
> voice (650) 926 2669
> fax (650) 926 2923
> CERN GSM +41 76 487 2069
>
>> -----Original Message-----
>> From: [log in to unmask]
>> [mailto:[log in to unmask]] On
>> Behalf Of Stephen J. Gowdy
>> Sent: Tuesday, August 21, 2007 7:45 AM
>> To: atlas-sccs-planning-l
>> Subject: Re: eval01 comparison
>>
>> Hi All,
>> Sorry for the extra email... the spreadsheet I attached
>> previously didn't include the yakut04 numbers (forgot to hit
>> "Save" first).
>>
>> regards,
>>
>> Stephen.
>>
>> On Tue, 21 Aug 2007, Stephen J. Gowdy wrote:
>>
>>> Hi All,
>>> So I've ran 1, 2, 4 and 8 jobs simultaneously on
>> eval01. I also ran
>>> one job on yakut04 to compare CPU speeds (so only look at
>> CPU time for
>>> that, wall time is probably not good to compare in this case). I've
>>> attached the spreadsheet with the numbers if anyone wants
>> to look at them.
>>> The basic conclusion is that the new Intel CPU's GHz
>> are worth about
>>> 15% more than the Opterons (this is a big change from the
>> P4s, where
>>> IIRC BaBar say a 30% drop). Overall we loose about 5% when running
>>> eight jobs on the same machine, with some coming from less CPU
>>> efficiency and more system time used (some more user time
>> too, particularly in going from 4 to 8 jobs).
>>> The job run was a simulation job which is the most CPU
>> intensive part
>>> of the ATLAS job suite. (only 3 events which took about 30 minutes).
>>>
>>> regards,
>>>
>>> Stephen.
>>>
>>> --
>>> /------------------------------------+-------------------------\
>>> | Stephen J. Gowdy, SLAC | CERN Office: 32-2-A22|
>>> | http://www.slac.stanford.edu/~gowdy/ | CH-1211 Geneva 23 |
>>> | | Switzerland |
>>> | EMail: [log in to unmask] | Tel: +41 22 767 5840 |
>>> \------------------------------------+-------------------------/
>>>
>>
>> --
>> /------------------------------------+-------------------------\
>> |Stephen J. Gowdy, SLAC | CERN Office: 32-2-A22|
>> |http://www.slac.stanford.edu/~gowdy/ | CH-1211 Geneva 23 |
>> | | Switzerland |
>> |EMail: [log in to unmask] | Tel: +41 22 767 5840 |
>> \------------------------------------+-------------------------/
>>
>
--
/------------------------------------+-------------------------\
|Stephen J. Gowdy, SLAC | CERN Office: 32-2-A22|
|http://www.slac.stanford.edu/~gowdy/ | CH-1211 Geneva 23 |
| | Switzerland |
|EMail: [log in to unmask] | Tel: +41 22 767 5840 |
\------------------------------------+-------------------------/
|