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Problems Seen During UXSS 2022

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Recommendation: if we use jupyter next time, have students get their own accounts (like an experiment).  With anatut there are too many "shared resources" that can bring down the system for everyone:

• disk space
• memory (everyone ends up on one server)
• "stop my server"
• opening "my server" brings up someone else's notebook
• (minor) default notebook name "Untitled1.ipynb" can create name conflict

many people using "anatut" account simultaneously (others using their own SLAC accounts)

had to continually watch:

• memory usage on anatut server node (where all processes run)
• anatut disk usage
• watch for server moving to another node (killed by either user clicking "stop my server" or OOM killer?) and duplicate servers
• kept a "canary" anatut notebook running all the time

~stilton2 had weka shome issue on gpu107, which prevented him from starting/stopping notebooks
database locked (two issues): this error traced down to having to jupyterhub servers running on the same node for user "anatut"

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