add the the table of processes data about the number of processes

[williamstein]

CoCalc projects have a pid limit that is 750. If you launch a large number of Jupyter notebooks (say), then you can easily hit this. Note that the way this limit evidently works is that it's not a limit on the number of processes output by "ps", but on the number of threads, as output by this:

$ ps -eL --no-headers | wc -l
728

This is in a project that was just hitting the limit, and then (from outside) I killed a few python processes.

We should (1) regularly monitor this number just like memory, cpu, etc., and (2) if it gets near the hardcoded limit of 750 (on kucalc at least), suggest actions, and possibly even automatically kill the least active notebooks.

[williamstein]

To see the exact threads using pids:

ps ax -L| more

E.g.,

$ ps ax -L|grep python |wc -l
710