Hi Gordon,
No, sorry I didn't. As all the code is in shared libraries at
least that part should be common. I expect though that most of the memory
used by jobs is data space which cannot be shared, so it is probably a
small effect. Would you like me to repeat it to get these numbers?
regards,
Stephen.
On Thu, 23 Aug 2007, Gordon Watts wrote:
> Hi Stephan,
> Did you look at total memory usage on the machine as you added the
> cores? Was it linear, or linear with a negative intercept (indicating a
> great deal of shared code between the processes)? Since you can't
> predict which jobs will be running on any one machine, this probably
> isn't a relevant number for this discussion, however, I'm curious to
> know how well ATLAS jobs do in this circumstance.
>
> Cheers,
> Gordon.
>
>> -----Original Message-----
>> From: [log in to unmask] [mailto:owner-
>> [log in to unmask]] On Behalf Of Stephen J. Gowdy
>> Sent: Tuesday, August 21, 2007 4:42 PM
>> To: ATLAS SCCS Planning
>> Subject: eval01 comparison
>>
>> 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 |
\------------------------------------+-------------------------/
|