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How can I find out which process/application uses Core number 4?

As I saw in Htop there isn't any application which uses high CPU, but still my fan is running "wild" and also the CPU graphic in Htop is 100%.

HTOP

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I don't know how to determine which process runs on a specific core, but I had a similar case once where 'System Monitor' didn't show all processes. Usually '(sudo) top' should list everything including the process which maxed out your 4th core. –  jhscheer Mar 5 at 17:38
    
I've found out. I have opened System Monitor --> Processes --> View All Processes. After that I've seen that the "apport" process was eating around 80%. –  vasiauvi Mar 5 at 17:40
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