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Resources on how to use the GPU clusters: das5, ivi and LISA.

General things to know

DO NOT stay idle on a GPU node.
Learn on how to create sessions with either screen or tmux. Opening a session and then submitting your job allows you to disconnect and then later resume (from a different location) and monitor the progress. tmux is not available on lisa.
nvidia-smi is useful to check the usage of GPUs on a node.
CUDA_VISIBLE_DEVICES=0 python myscript.py will only make the GPU:0 visible to python. Alternatively, you can specify it within your python script.
You can create a bash script with multiple parallel jobs that you will submit via slurm. Here is an example:

CUDA_VISIBLE_DEVICES=0 python exp1.py & \
    CUDA_VISIBLE_DEVICES=1,2 python exp2.py & \
    CUDA_VISIBLE_DEVICES=3 python exp3.py & \
    wait

A quick tutorial on how to use das4 is available here.