Slurm: apply --ntasks-per-node to job arrays

How do I get --ntasks-per-node to work with job arrays?

I have a test where I submitted a job array of 1-5000 using --ntasks-per-node=2 onto a grid with 36 nodes appearing in sinfo... and it's running >1000 jobs at a time.

I've also tried using --tasks-per-node, --ntasks, etc, even tried both --ntasks=1 and --ntasks-per-node=2 and nothing limits it.

I'm guessing Slurm's model of this is messed up and "arrays" don't count against the number of tasks so, while each individual job within an array is limited, the total array isn't limited.

How do I limit the array to n jobs per node?

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