[GE users] slot oversubscription

Reuti reuti at staff.uni-marburg.de
Thu Jul 31 11:24:46 BST 2008


Am 31.07.2008 um 11:30 schrieb Alois Dirnaichner:

> Reuti wrote:
>> Hi,
>>
>> Am 29.07.2008 um 15:02 schrieb Alois Dirnaichner:
>>
>>> since I've changed the load formula for our cluster to "slots"
>>> according to
>>>
>>> http://blogs.sun.com/sgrell/date/20050405
>>>
>>> to achieve a fill up configuration, oversubscription of slots per  
>>> hosts
>>> occured from time to time:
>>>
>>> HOSTNAME                ARCH         NCPU  LOAD  MEMTOT  MEMUSE   
>>> SWAPTO
>>> SWAPUS
>>> -------------------------------------------------------------------- 
>>> -----------
>>>
>>> global                  -               -     -       -       -
>>> -       -
>>> duncan02                lx24-amd64      8  0.00   15.7G  238.4M
>>> 16.0G     0.0
>>>    GHOLA                BP    9/8      d
>>>
>>> In spite of
>>>
>>> slots=8
>>>
>>> in the host conf. and slots defined consumable.
>>> How could this happen?
>>
>> did you reduce the number of slots after the change? What is showing
>> up when you check the queue with qstat -f -u "*" -q "GHOLA at duncan02"?
> There were no more oversubscribed hosts ever since, so I can't provide
> this information. Perhaps it was just some strange overload  
> behaviour of
> qmaster: We had to reboot the server recently.
> What do you mean with "reduce the number of slots"? All slot complexes
> had been set correctly hostwise and queuewise.

It was just an idea: in case you define 10 slots, get 9 running jobs  
and then you reduce the definition of slots for a particular queue  
and/or exechost, then you will face such an output for sure.

-- Reuti


> Thanks anyway.
>>
>> -- Reuti
>>
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>
>
> -- 
>
> Alois Dirnaichner
>
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