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

Paul Brunk pbrunk at uga.edu
Fri Jun 18 03:22:37 UTC 2021


If you (Shaohao) mean you want to limit all running jobs to the sum of
up to N non-array-jobs and up to M array jobs, could you have N
"local" licenses of LicenseName 'nonarray' (e.g.) and M "local"
licenses of LicenseName 'array', and cause job_submit lua to add a
request for a license of the relevant type to each submission?

Flailing wildly at the keyboard,
Paul Brunk, system administrator
Georgia Advanced Computing Resource Center
Enterprise IT Svcs, the University of Georgia

From: slurm-users <slurm-users-bounces at lists.schedmd.com> On Behalf Of Prentice Bisbal
Sent: Thursday, June 17, 2021 15:30
To: slurm-users at lists.schedmd.com
Subject: Re: [slurm-users] [External] Different max number of jobs in individual and array jobs


... to complete my thought, I don't think what you want to do is possible. If M is the number of job steps, and N is total jobs, M cannot be greater than N.

On 6/17/21 3:24 PM, Prentice Bisbal wrote:

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 https://slurm.schedmd.com/slurm.conf.html:
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:

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.

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