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Standard sessions on login nodes do not guarantee access to dedicated resources such as cpus or memory, and strict limits on those are imposed. For interactive sessions with dedicated resources we will use ecinteractive. 

It is installed and available on all the Atos HPCF and ECS nodes, as well as the VDI. If you are connecting from your own computer with teleport, you can download it and run it there (only Mac, Linux or Windows WSL are supported).

1. Can you get a dedicated interactive session with 10 GB of memory and 4 cpus for 8 hours?

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   title Solution
   You can use ecinteractive . It is installed and available on all the Atos HPCF and ECS nodes, as well as the VDI, so you can run it from therelike so: No Format ecinteractive -c 4 -m 10 -t 8:00 This will create an interactive job with the requested configuration and land you on a shell in a given node.If you are connecting from your own computer via teleport, you can download it and run it there (no Windows native support, only Mac, Linux or WSL supported). Note that by default and unless ran directly on ECS, ecinteractive will use HPCF as the backend. If you wish to force the session to be on ECS, you can dopass the extra option -p ecs No Format ecinteractive -p ecs -c 4 -m 10 -t 8:00

   
   

2. Log out of that interactive session. Can you reattach to it?

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   title Solution
   Your job kept running in the background, and there can only be one interactive job per user. You can attach as many concurrent shells to the same interactive session, for example in different terminal tabs, with: No Format ecinteractive If on ECS, you may want need to run: No Format ecinteractive -p ecs

   
   

3. How can you get information (amount of resources, time left, etc) of your active ecinteractive session?

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   title Solution
   At any point, from any session, you can query ecinteractive for any active sessions with: No Format ecinteractive -q If on ECS, you may want need to run: No Format ecinteractive -p ecs -q

   
   

4. Cancel your interactive session

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   title Solution
   No Format ecinteractive -k If on ECS, you may want need to run: No Format ecinteractive -p ecs -k

   
   

5. We can also use ecinteractive to open a JupyterLab instance on the Atos HPCF or ECS. Start a JupyterLab session with 4 GB of memory. When you are happy, cancel the ecinteractive job, since only closing the browser tab will not stop the session.

   Tip
   title Where to run it
   You must run ecinteractive from either VDI or your own computer. If you run the command on the Atos HPCF or ECS, it will not be able to open any browser window.

   
   

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   title Solution
   From VDI or your own computer, you can start up jupyter like so No Format ecinteractive -j -m 4 If you want to start it on ECS, you will need to do No Format ecinteractive -j -m 4 -p ecs No Format ecinteractive -k If on ECS, you may want need to run: No Format ecinteractive -p ecs -lk If you still have the JupiterLab tab open in your browser, you will notice it will stop working.