[Halld-offline] ifarm = CentOS 7.7 now [Re: [Jlab-scicomp-briefs] JLab Scientific Computing Upcoming Changes]

[Mark Ito]

People,


I got some clarification from Bryan on the meaning of the farm OS tags. 
Here is his explanation:


""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""

Auger jobs that are submitted without an OS tag at all now default to 
CentOS7.7. We didn't change the meaning of the tags:

  * centos7 - deprecated; points to CentOS7.2; will go away with CentOS 7.2
  * centos72 - centos72 nodes only
  * centos77 - centos77 nodes only
  * general - OS agnostic; schedule jobs on any OS. This lets jobs that
    can run on any CentOS flavor consume whatever is free.

We also added a tag for "amd" and "xeon" in case you have code optimized 
for a particular chip.
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""

Note that this falsifies the last paragraph in my previous email 
(below). So please ignore that. At least I added heavy qualifiers... ;-)

   -- Mark


On 1/22/20 11:09 AM, Mark Ito wrote:
>
> Folks,
>
>
> Note the item quoted below from Bryan last Thursday. This means that 
> when you log into ifarm today, you are logging into a different OS 
> than you had when you logged in yesterday. Our software packages need 
> to distinguish between code built on CentOS 7.2 vs. that built on 
> CentOS 7.7. That means stuff you compiled yesterday is not suitable 
> for jobs you are running today. On ifarm, you need to recompile 
> everything that you compile yourself.
>
>
> Bryan also mentioned:
>
>
> > Auger jobs submitted after Tuesday morning, January 21st will default to CentOS 
> 7.7.
>
>
> I think that means that batch farm default for CENTOS7 nodes changed 
> its default. [Someone should correct me here if that is incorrect.] 
> Assuming I am right about that, if you choose vanilla CENTOS7 in your 
> farm jobs, and it worked yesterday, it might not today if it depends 
> on code you compile yourself, for reasons similar to those described 
> above.
>
>
>   -- Mark
>
>
> On 1/16/2020 9:33 AM, Bryan Hess wrote:
>> *Interactive Farm Upgrade to CentOS 7.7*
>>
>> On Tuesday, January 21st the /ifarm.jlab.org/ alias will be pointed 
>> to CentOS 7.7 hosts only. ifarm1801 will be upgraded to CentOS 7.7. 
>> After that change, the interactive farm will consist of ifarm1801 and 
>> ifarm1802 running Intel Skylake processors, and ifarm1901 run AMD 
>> Epyc "Rome" processors. The older ifarm1401 and ifarm1402 systems 
>> will remain at CentOS 7.2 until the farm is completely transitioned, 
>> at which point they will be retired.
>>
>>
>> --Bryan
>>
>>
>>
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>
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