[GE users] scheduler runs performance sge6.0u6 vs. sge6.0u7

Stephan Grell - Sun Germany - SSG - Software Engineer stephan.grell at sun.com
Tue Dec 13 12:54:41 GMT 2005



Nicolas Joly wrote On 12/13/05 10:36,:

>On Tue, Dec 13, 2005 at 09:23:47AM +0100, Stephan Grell - Sun Germany - SSG - Software Engineer wrote:
>  
>
>>Nicolas Joly wrote On 12/12/05 21:12,:
>>
>>    
>>
>>>On Mon, Dec 12, 2005 at 08:43:29PM +0100, Reuti wrote:
>>> 
>>>
>>>      
>>>
>>>>Hi,
>>>>
>>>>this is a really short schedule_interval. Did you try to set it to a  
>>>>minute or so and adjust the value of flush_submit_sec to one or two  
>>>>seconds instead (seems you are looking for an immediate scheduling)?
>>>>   
>>>>
>>>>        
>>>>
>>>I thought i already tested this configuration. Just to be sure, i did
>>>it again ... and it works as expected.
>>>
>>>For now, we only have interactive jobs on this cluster (but i suspect
>>>that in a few weeks we'll have to support some batch ...), and
>>>immediate like scheduling is what we are indeed looking for.
>>>
>>>Thanks a lot.
>>>
>>>      
>>>
>>Did the issue go away?
>>    
>>
>
>Yes. With schedule_interval set to 00:01:00 and flush_submit_sec=1, i
>got the expected behaviour.
>
>  
>
>>Based on your profiling data, I would think that it does not make a
>>difference. The scheduler spend its time in the communication with
>>the qmaster and not processing anything.
>>    
>>
>
>I don't really understand why it takes so long ... The qmaster &
>scheduler are located on a 2 CPUs opteron machine. And, last time i
>checked, this machine load was very small.
>
>  
>
>>|P|PROF: send orders and cleanup took: 3.090 (u 0.010,s 0.000) s
>>
>>Your changes in the flush-settings should not change
>>anything. However, the setup Reuti suggested is the one we
>>recommend.
>>    
>>
>
>That's why i asked for help. I already tried tried the flush
>parameters but got no difference. It was probably with
>schedule_interval set to 1 second ...
>
We might have to look into it from our side. It might indicate a bug.

Stephan

>
>Thanks.
>
>  
>


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