====== htop ======

''htop'' is an enhanced and more interactive ''top''. It is a terminal user interface that shows processes memory and CPU usage.
See [[https://peteris.rocks/blog/htop/|peteris.rocks's htop write-up]] for many details and nuances.

''htop'' is useful to see how busy [[:admin:it:rhea]] is before launching a bunch of jobs/threads or otherwise allocating a large cpu pool.

Also see ''iotop'', "load average" in ''uptime'', and, on rhea, http://rhea.wpic.upmc.edu/gangilia


{{:tools:pasted:20231121-094533.png?height=400px}}

===== Colors =====
The colors of CPU usage are informative.  If you see a lot of gray, disk usage is limiting processing (jobs might finish faster with fewer forks/threads).

{{:tools:pasted:20231121-093728.png}}