[GE users] Advance reservation strange behavior

Craig Tierney ctierney at hypermall.net
Mon Jun 12 15:11:22 BST 2006


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Jean-Paul Minet wrote:
> Hi,
> 
> When submitting jobs with advance reservation, I am observing quite a 
> strange behavior...
> 
> Submitting a job with advanced reservation (test_ar), it doesn't get 
> allocated any priority (tickets only, based on fair share only):
> 
> job-ID  prior   nurg    npprior ntckts   ppri name       user         
> state submit/start at     queue                          slots ja-task-ID
> ---------------------------------------------------------------------------- 
> 
> [...]
>  13149 0.00000 0.00000 0.00000 0.00000     0 test_ar    root         qw 
> 06/08/2006 11:46:48                                   20
> 
> If I then submit the same job but without advanced reservation (test), 
> it gets its normal priority, while the advanced reservation job remains 
> at 0 priority.
> 
>   13151 0.50000 0.00000 0.50000 0.50000     0 test       root         qw 
> 06/08/2006 11:48:49                                   20
> [...]
>   13149 0.00000 0.00000 0.00000 0.00000     0 test_ar    root         qw 
> 06/08/2006 11:46:48                                   20
> 
> In the scheduler config, I have
> 
> [...]
> max_reservation                   20
> [...]
> 
> Is this an expected behavior?
> 

SGE does not support the gathering of resources prior to runtime to
ensure that the code runs at the time requested (advanced reservations).
It does support the running of code at a requested time, and if at that
time the job does not have enough resources it will aggressively gather 
those resources until it can run (reservations).

What time was the job scheduled to run?  I thought that the priority
for jobs with reservations stays zero until after the start time has passed.

Craig



> Thanks for any info/help
> 
> Jean-paul
> 
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