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?
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?
Press h inside htop for quick help.
CPU
Blue : Low-priority threads
Green : Normal priority threads
Red : Kernel threads
Turquoise : Virtualization threads
Memory
Green : Used memory
Blue : Buffers
Yellow/Orange : Cache
Also, in the list of processes, there are some that appear in Green. The black ones are main processes and the Green ones are threads. In my example below, I'm running a repair on a Cassandra node and as we can see most entries are threads.
Specific to AWS, yellow bars can mean your virtual CPUs are being throttled because they've gone past burstable limit (AWS Burstable Link). This is common with AWS t2 instances.