htop screenshot

For the CPU cores, I think that blue means nice, green normal CPU use and red I/O. But I'm not sure and I haven't found a definite answer.

Then there are the colors for memory. What do green, blue and yellow mean there?

  • 3
    I lack the reputation credits to flag this as duplicate, but see the answer at serverfault.com/questions/180711/…, which is a copy of your question and has been answered. – Caleb Xu Jan 8 '14 at 4:04
  • 1
    @CalebXu You cannot flag it as a duplicate of a question on another site, but you can post an actual answer here, linking to it. – slhck Jan 8 '14 at 8:08

Press h inside htop for quick help.


Blue      : Low-priority threads
Green     : Normal priority threads
Red       : Kernel threads
Turquoise : Virtualization threads


Green         : Used memory
Blue          : Buffers
Yellow/Orange : Cache

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