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Slow login node?

If you think the login nodes are slow, you can report it to us! Rather than just saying "I think the login node is slow" please include information about which login node, on which system, what where you doing? Was it while running an application? which application?, or transferring files? etc.

Fair share

We try to give users equal CPU share on the login nodes. This means that the impact to other users if one or a few users run applications that want to use lots of CPU is much less than you might expect. Any given user can only get up to 4 CPU-cores and 20GB RAM on one login node. All users combined can only use 80% of the totally available cores and RAM on one login node.

I/O

Slowness very often comes from I/O bandwidth. To avoid this in the future, we are implementing a specialised data-mover node. Please try to avoid very large data operations on a login node. SUch processes can be done via a compute nodes.

Temporary fix

  • Use another login node. You can either login directly to that login node (e.g ssh l50.vsc.ac.at)

  • Request an interactive session on a compute node.