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How to narrow down what is taking 100% CPU on alternating cores
January 6, 2018
Edited: June 12, 2020
September 20, 2023
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Whilst watching video one core will spike to 100% for a few moments drop off and then another core will spike to 100%.
- CPU MHz running over 3000 Mhz (3 GHz) when it is normally around 1000 MHz
- Temperature about 20 degrees Celsius above normal.
Narrowing it down
While writing this question I accidentally closed the chrome tab with the video on external monitor. CPU frequencies and load dropped to normal. I’ve noticed before how
apt-get will spike a single CPU to 100% but this problem is nothing like that.
The process causing abnormal behaviour is
chrome but what steps can be taken to narrow it down? ie Can a certain sub-process be identified within video codec-land (whatever you call it) and targeted for bug reporting?
Version 63.0.3239.132 (Official Build) (64-bit)