[Wien] time difference among nodes

[Luis Ogando]

Dear Prof. Marks,

   Thanks !
   I will send your message to the administrators !
   All the best,
               Luis


2015-09-29 8:57 GMT-03:00 Laurence Marks <laurence.marks at gmail.com>:

> If it happens again, one thing to ask them to check is swap usage and how
> much memory is cached. On some of my nodes I have noticed that they do not
> always release cached memory, and can start swapping. If this happens the
> job will get very slow. The commands to use to clear the cache can be found
> at
>
> http://www.tecmint.com/clear-ram-memory-cache-buffer-and-swap-space-on-linux/
> or similar. (Needs root access.) Top can also show memory use.
>
> While there should be no need to do this, I have noticed that I need to do
> it every 3hrs on 4 nodes - the other 20 don't need it. It is an issue
> mainly for big calculations.
>
> Alternatively it was something else, a zombie, big log files or other
> things. Rebooting gets rid of a lot of system caches and helps -- even on
> my Android tablet every week or two. It's murky waters.
>
> ---
> Professor Laurence Marks
> Department of Materials Science and Engineering
> Northwestern University
> http://www.numis.northwestern.edu
> Corrosion in 4D http://MURI4D.numis.northwestern.edu
> Co-Editor, Acta Cryst A
> "Research is to see what everybody else has seen, and to think what nobody
> else has thought"
> Albert Szent-Gyorgi
> Hi Elias,
>
>    There were no other jobs in the specific queue I was using and the
> nodes are dedicated to that queue, so, it was the opportunity to reboot
> them without furious reactions from other users.
>    After trying everything suggested by the Wien2k community, the
> administrators resignedly remembered the words of wisdom given by the
> cluster guru, Shakespeare, and followed the suggestion given by Lyudmila
> Dobysheva. In other words, they killed my job, restarted all the nodes and
> I resubmitted the calculation
>    All the best,
>                      Luis
>
>
> 2015-09-29 3:50 GMT-03:00 Elias Assmann <elias.assmann at gmail.com>:
>
>> -----BEGIN PGP SIGNED MESSAGE-----
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>>
>> On 09/28/2015 01:58 PM, Luis Ogando wrote:
>> > The problem is solved ! The solution was one suggested by Lyudmila
>> > Dobysheva : reboot the nodes. We will never know the origin of the
>> > problem, but, honestly, I do not care !
>>
>> Good to hear that!  So, how did you get the admins to reboot them?
>>
>> > "There are more things in heaven and earth, Horatio, Than are
>> > dreamt of in your philosophy."
>>
>> That is an apt quote for people working on clusters ;-).
>>
>>
>>         Elias
>>
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