Add information on sbatch --exclusive option

[atombaby]

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https://sciwiki.fredhutch.org/scicomputing/compute_jobs/

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It's not documented in the wiki, but a common pattern is to add the option --exclusive to job requests to get full access to the nodes resources.

There is an interesting side effect here where the GPU is included in this allocation, so jobs with the --exclusive option will have the GPU present in the cgroup and will be limited by GPU limits for the association.

c.f.

Note limitation, provide advice.

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