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2/ ohh, and btw, see also this related post from @brendangregg, which was written a few years ago, but for some people likely still is news:
https://www.brendangregg.com/blog/2017-05-09/cpu-utilization-is-wrong.html
See also this short video from Brendan about the topic: https://www.youtube.com/watch?v=QkcBASKLyeU
Brendan Long writes: ""I deal with a lot of servers at work, and one thing everyone wants to know about their servers is how close they are to being at max utilization. It should be easy, right? […]
And yet, whenever people actually try to project these numbers, they find that CPU utilization doesn't quite increase linearly. But how bad could it possibly be?
To answer this question, I ran a bunch of stress tests and monitored both how much work they did and what the system-reported CPU utilization was, then graphed the results.""