Get the Recent CPU Load
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.
This function works only Unix-like system with
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
loadavg <- cpuLoad() print(loadavg) #> 1min 5min 15min #> 0.61 0.71 0.71