Re: [Condor-users] Understanding job scheduling

[Dan Bradley <dan@xxxxxxxxxxxx>]

The condor negotiator is responsible for matching new machines to job 
submitters.  Negotiation currently happens in cycles, with a minimum 
spacing of 20 seconds between cycles.  From your description, it sounds 
like 2 jobs were in the queue when the first negotiation cycle happened, 
and then when the next negotiation cycle happened, all the rest of the 
jobs were in the queue.

--Dan

Ian Stokes-Rees wrote:

> Hi, I'm trying to understand how Condor job scheduling works.  I have 
> a condor pool with 18 "Unclaimed" slots.  I submit 30 "sleep 90" 
> jobs.  2 of them start quite promptly, but the next 16 take 20 seconds 
> before they are matched, then all start at once:
>
> -- Submitter: abitibi.sbgrid.org : <10.0.10.39:52783> : abitibi.sbgrid.org
>  ID      OWNER            SUBMITTED     RUN_TIME ST PRI SIZE 
> CMD              
>   93.0   ijstokes        3/21 12:42   0+00:00:56 R  0   0.0  sleep 
> 90         
>   94.0   ijstokes        3/21 12:42   0+00:00:56 R  0   0.0  sleep 
> 90         
>   95.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>   96.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>   97.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>   98.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>   99.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>  100.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>  101.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>  102.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>  103.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>  104.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>  105.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>  106.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>  107.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>  108.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>  109.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 
> 90         
>  110.0   ijstokes        3/21 12:42   0+00:00:35 R  0   0.0  sleep 90
>
> Why does this happen?
>
> Cheers,
>
> Ian
>
> --
> Ian Stokes-Rees                            W: http://sbgrid.org
> ijstokes@xxxxxxxxxxxxxxxxxxx               T: +1 617 418-4168
> SBGrid, Harvard Medical School             F: +1 617 432-5600
>
>  
>
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