[Beowulf] bizarre scaling behavior on a Nehalem

Craig Tierney Craig.Tierney at noaa.gov
Wed Aug 12 14:22:15 EDT 2009


Rahul Nabar wrote:
> On Wed, Aug 12, 2009 at 1:02 PM, Craig Tierney<Craig.Tierney at noaa.gov> wrote:
>> When you run uname -a you don't get something like:
> 
>> [ctierney at wfe7 serial]$ uname -a
>> Linux wfe7 2.6.18-128.2.1.el5 #1 SMP Thu Aug 6 02:00:18 GMT 2009 x86_64 x86_64 x86_64 GNU/Linux
> 
> uname -a
> Linux node25 2.6.18-128.el5 #1 SMP Wed Jan 21 10:41:14 EST 2009 x86_64
> x86_64 x86_64 GNU/Linux
> 
> So it does seem that yours might be a little newer than mine (the 2.1 suffix?)
> 
> 
>> We did build our kernel from source, only because we ripped out
>> the IB so we could build from the latest OFED stack.
> 
> We didn't. We used the latest from the CentOS website.
> 
>> Try:
>>
>> # rpm -qa | grep kernel
>>
> 
> rpm -qa | grep kernel
> kernel-devel-2.6.18-128.el5
> kernel-headers-2.6.18-128.el5
> kernel-2.6.18-128.el5

Weird.  You might try and see if there are later packages to install.

Craig


-- 
Craig Tierney (craig.tierney at noaa.gov)
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