htop Bar Color Meaning
htop is super helpful tool to monitor system usage included CPU, memory, opening threads and so on. As we can see, there are several colors in cpu/memory bar which make us confused their meaning. However, this SO question clarified that fortunately.
Blue: low priority processes (nice > 0) Green: normal (user) processes Red: kernel time (kernel, iowait, irqs...) Orange: virt time (steal time + guest time)
Blue: low priority threads (nice > 0) Green: normal (user) processes Red: system processes Orange: IRQ time Magenta: Soft IRQ time Grey: IO Wait time Cyan: Steal time Cyan: Guest time
Memory meters are more straightforward:
Green: Used memory pages Blue: Buffer pages Yellow/Orange: Cache pages
Note: Info obtained from htop source code at https://github.com/hishamhm/htop/blob/master/CPUMeter.c
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