[GE users] What does the definition of slots for a cluster queue mean?

Reuti reuti at staff.uni-marburg.de
Wed Jan 16 19:40:16 GMT 2008


Hi,

Am 16.01.2008 um 20:00 schrieb Chris Dagdigian:

>
> Hi Craig,
>
> In SGE 6 and later we now have to distinguish between "cluster  
> queue" and "queue instance".
>
> The "cluster queue" is used to refer to the queues that span many  
> machines (all.q for instance)
> The "queue instance" refers to the specific instance on a certain  
> machine (all.q at node001 for instance)
>
> So to answer your question:
>
>  - You will have 32 slots in your cluster or "cluster queue"
>  - You'll have 2 slots by default in each of your queue instances
>
> Slots can be defined at the cluster queue level and also at the  
> machine level. At the cluster queue level the slot count refers to  
> the total number of job slots available. At the queue instance  
> level it refers to the slots that are available just at the local  
> machine.

to answer the other question: put a 2 in the queue definition for the  
slot count. It will be per queue instance.

Another place to limit the slot count per machine as you say is the  
exechost's definition. But this is only useful, if you have more than  
one queue on this machine.

-- Reuti


> Globally speaking people will understand you if you talk about  
> having 32 job slots in your cluster.
>
> Regards,
> Chris
>
>
>
> On Jan 16, 2008, at 1:52 PM, Craig Tierney wrote:
>
>> I was reading the definition of slots for queues, and I am
>> confused by it.  It reads:
>>
>> slots
>>       The maximum number of concurrently executing jobs allowed in  
>> the queue.  Type is number.
>>
>> Is the slots value relative to each host in the cluster queue, or
>> the total number of jobs that can be in the cluster queue?
>>
>> I have 16 nodes, each with 2 processors.  Does this mean the number
>> of slots for the queue should be "32" or "2"?
>>
>> Thanks,
>> Craig
>>
>> -- 
>> Craig Tierney (craig.tierney at noaa.gov)
>>
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