I have a 4GB machine, and when launching Ubuntu 18.04 (gnome) on this machine, it uses 1.4GB of ram just after booting.

I tried the same ISO on another machine with 8GB, and it uses 3.6GB of ram just after booting.

Why Ubuntu is having such behavior? Does Ubuntu do that to improve performance?

Thanks in advance.

  • 3.6GB is a lot for just the OS. Probably you have something memory-intensive running, like a web browser. Did you check the System Monitor for details? – wjandrea May 8 '18 at 18:07
  • it's a new installation, and I did the test just after the reboot, so I don't think there is processes that are eating memory. – Sidahmed May 8 '18 at 18:08
  • 1

You could get a hint of what is happening with memory in those systems with

top -o %MEM

With that command you will get all processes sorted by memory usage. Maybe the additionnal memory is used for buffering ?

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