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why those processes appear if they are not consuming any cpu or memory. Is there any way to show only process that are really consuming memory or cpu?

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  1. Processes with 0% CPU/RAM usage are kernel threads.

  2. You can always run top or htop and use P T M keys to sort by CPU usage, CPU time and memory usage.

  3. Pressing 0 in top will hide zeros on the screen which makes it look less cluttered.

  4. To hide kernel threads from ps output please refer to Is there any way to hide kernel threads from ps command results?