Hi, which one is correct?
htop shows 1.7 GB of RAM usage, while the System Monitor shows 2.7 GB. At one point, the System Monitor even showed 3.2 GB, while htop displayed lower usage.
One is probably also including cache, buffers and/or shared memory, while the other does not and only shows application data.
So they are both correct. 
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Thank you!
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You can also use the free command to see how much memory is being used.
For example, this is the output of free -h (the -h is for human-readable output) on my system:
free -h
total used free shared buff/cache available
Mem: 28Gi 5.1Gi 6.8Gi 555Mi 17Gi 23Gi
Swap: 28Gi 5.0Mi 28Gi
I also run Firefox in RAM, which adds a couple of gigabytes to my RAM usage.
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