[gridengine users] Core Binding on Magny-Cours

[Reuti]

Am 14.03.2011 um 16:11 schrieb Esztermann, Ansgar:

> On Mar 12, 2011, at 1:04 , Dave Love wrote:
> 
>> "Esztermann, Ansgar" <Ansgar.Esztermann at mpi-bpc.mpg.de> writes:
>> 
>>> Well, core IDs are unique only within the same socket ID (for older CPUs, say Harpertown), so I would assume the same holds for node IDs -- it's just that node IDs aren't displayed for Magny-Cours.
>> 
>> What exactly would you expect?  hwloc's lstopo(1) gives the following
>> under current RedHat 5 (Linux 2.6.18-238.5.1.el5) on a Supermicro H8DGT
>> (Opteron 6134).  It seems to have the information exposed, but I'm not
>> sure how it should be.  (I guess GE should move to hwloc rather than
>> PLPA, which is now deprecated and not maintained.)
>> 
>> Machine (63GB)
>> Socket #0 (32GB)
>>   NUMANode #0 (phys=0 16GB) + L3 #0 (5118KB)
>>     L2 #0 (512KB) + L1 #0 (64KB) + Core #0 + PU #0 (phys=0)
>>     L2 #1 (512KB) + L1 #1 (64KB) + Core #1 + PU #1 (phys=1)
>>     L2 #2 (512KB) + L1 #2 (64KB) + Core #2 + PU #2 (phys=2)
>>     L2 #3 (512KB) + L1 #3 (64KB) + Core #3 + PU #3 (phys=3)
>>   NUMANode #1 (phys=1 16GB) + L3 #1 (5118KB)
>>     L2 #4 (512KB) + L1 #4 (64KB) + Core #4 + PU #4 (phys=4)
>>     L2 #5 (512KB) + L1 #5 (64KB) + Core #5 + PU #5 (phys=5)
>>     L2 #6 (512KB) + L1 #6 (64KB) + Core #6 + PU #6 (phys=6)
>>     L2 #7 (512KB) + L1 #7 (64KB) + Core #7 + PU #7 (phys=7)
> ...
> 
> That's exactly what I'd expect...
> The interface at /sys/devices/system/cpu/cpuN/topology/ doesn't know about NUMANodes, only about Sockets and cores. Thus, cores #0 and #4 in the output above have the same core ID, and SGE interprets that as being one core with two threads.

`lscpu` also seems to do it in the correct way for me, although I found discussions on the net that it's also not working under certain circumstances.

-- Reuti


> 
> A.
> -- 
> Ansgar Esztermann
> DV-Systemadministration
> Max-Planck-Institut für biophysikalische Chemie, Abteilung 105
> 
> 
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