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How can a compute node in an active allocation be accessed?

In order to obtain a shell on a compute node on which a job is currently running the following command can be used.

srun -n 1 -N 1 --jobid <jobid> -r <rel. node number> --cpu_bind=none --gres=gpu:0 --pty /bin/bash -i

Here, <jobid> must be replaced with the id of the allocated job and <rel. node number> specifies the relative node number (starting at zero) within the nodes allocated to the job.