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I'm using Ubuntu 12.04 with LXDE desktop environment.

Sometimes my computer runs really slowly and the LXDE its CPU graphic shows a permanent 100% CPU usage. However, when I'm opening htop in a terminal, it says only ~10-30% of CPU is used. Why doesn't htop show all processes so I can see which process is eating my CPU?

Thanks

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migrated from stackoverflow.com Aug 8 '12 at 8:01

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You might want to delete this question and ask it on askubuntu.com. Also try to give more information, e.g., how often and when does this happen, also adding a screenshot of htop and the CPU graphic might be useful. –  Sicco Aug 6 '12 at 12:26

2 Answers 2

I would guess that you have a multi-core cpu and only one core is at 100%. htop will list activity for all cores. Try top instead. If one of your cores is at 100% top will show 100% cpu usage.

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Run htop under an administrative account like root, you can use su - to drop in a root shell to execute htop or you can instead run sudo htop if you have sudo installed.

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