For running computation on PC2 cluster systems you should always submit your computations as jobs to the workload manager. Details can be found in https://uni-paderborn.atlassian.net/wiki/spaces/PC2DOK/pages/12944324/How+to+generally+submit+a+job Running Compute Jobs .
Please Note: Login nodes are only there to prepare your compute jobs and for light analysis tasks. If you have heavier analysis tasks please also submit them as a compute job.
If you need a graphical user interface for job preparation or analysis we recommend using the remote desktop functionality of our Jupyter Hub .