CPU Utilization is Wrong (2017)(www.brendangregg.com)

40 pointsby adityaathalye5 months ago2 comments

kvemkon5 months ago
Related recent discussion: "%CPU utilization is a lie".
https://news.ycombinator.com/item?id=45110688
- dang5 months ago
  Thanks! I was just coming here to mention that. Macroexpanded:
  %CPU utilization is a lie - https://news.ycombinator.com/item?id=45110688 - Sept 2025 (162 comments)
  Also these past discussions of the OP:
  CPU Utilization Is Wrong (2017) - https://news.ycombinator.com/item?id=36580006 - July 2023 (57 comments)
  CPU Utilization Is Wrong - https://news.ycombinator.com/item?id=23827032 - July 2020 (1 comment)
  CPU Utilization is Wrong - https://news.ycombinator.com/item?id=14301739 - May 2017 (91 comments)
dvh5 months ago
I always understood it "how many CPU cores would I need so that they all run at 100%"
E.g. if I have 1 core and utilization is 3 then if I had 3 cores they would run exactly at 100%
- zamadatix5 months ago
  The problem (or really, nuance) comes when you try to define what "run exactly at 100%" means.
  - adityaathalye5 months ago
    Yeah, I love the expression the "Flaw of the Averages".
    Depends on what you're counting, among other things. (Not to mention when you took the samples being averaged).
- 5 months ago
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