An interactive session is , in research cluster parlance, a scheduler job where you are free to enter run commands the same as if you logged into the server via SSHcan run commands in real-time (i.e., it is qualitatively identical a remote session started via Secure Shell or a terminal session that you've started on your laptop). If you're developing code in the cluster environment , want to check your code, or just run some commands on a cluster node or your analysis workflow isn't well-defined and you need to experiment with different command line tools then this is the option you want.The job will stay open similar to an ssh session, that is if you disconnect the session the job is over. This limitation can be circumvented through the use of programs such as screen or tmux
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Similar to a Secure Shell (SSH) session or a terminal window, if you close your interactive session the applications that are running in it will be quit and the resources will be freed up for use by other jobs on the cluster. If you need your interactive session to persist, we recommend using the screen or tmux utilities on the login node. Tutorials for these tools can be found below: |
To run a simple an interactive job on the cluster use , invoke the srun command as shown below.on the login node (axon.rc) as demonstrated below:
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srun --pty bash -i |
Running the above command on the login node This command would start an interactive job with the default limits. After running this you You would then be running from one of the three gpu be provided with a session on one of Axon's nodes with one CPU core (and no GPU) allocation for a length of five daysfor the default job time limit (see here; currently 10 days as of 3/21).
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srun --pty -c 2 --nodelist=ax08 --gres=gpu:gtx1080:2 -t 0-01:00 /bin/bash |
In the command above the parameters are a as follows:
--pty says to start a pseudo terminal interactive session (mandatory for interactive sessions).
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