[slurm-users] [External] Different max number of jobs in individual and array jobs

Prentice Bisbal pbisbal at pppl.gov
Thu Jun 17 19:24:36 UTC 2021

II know I'm a few weeks late with this response. I actually looked into 
this 4-6 weeks ago. According to the Slurm documenntation, an individual 
job step counts as a job when evaluating job limits. Pay attention to 
the note in the documenation below. From 

> *MaxJobCount*
>     The maximum number of jobs Slurm can have in its active database
>     at one time. Set the values of *MaxJobCount* and *MinJobAge* to
>     ensure the slurmctld daemon does not exhaust its memory or other
>     resources. Once this limit is reached, requests to submit
>     additional jobs will fail. The default value is 10000 jobs. NOTE:
>     Each task of a job array counts as one job even though they will
>     not occupy separate job records until modified or initiated.


On 6/3/21 11:12 AM, Shaohao Chen wrote:
> Hi,
> We use Slurm on our cluster and set a max number of all jobs. But we 
> would want to implement this: N concurrent individual jobs and M 
> concurrent jobs in all job arrays (e.g. m job arrays with n jobs in 
> each and M=n*m), and M is much larger than N. I have read the Slurm 
> documentation, but cannot find a way to separate the individual jobs 
> and jobs in arrays. Does anyone know how to do that?
> Thank you.
> Shaohao
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