Get the Recent CPU Load
This function works only Unix-like system with ‘/proc/loadavg’.
A named numeric vector with three elements
15min with non-negative values.
These values represent estimates of the CPU load during the last minute,
the last five minutes, and the last fifteen minutes .
An idle system have values close to zero, and a heavily loaded system
have values near
If they are unknown, missing values are returned.
Linux Load Averages: Solving the Mystery, Brendan Gregg's Blog, 2017-08-08, http://www.brendangregg.com/blog/2017-08-08/linux-load-averages.html
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