Gnome system monitor vs htop on RAM usage

[fch]

Hello, any one can tell why there's a huge difference on RAM usage on gnome system monitor showing much more than on htop?

[NorthEast]

An initial look at the files which each application opens might be of interest. For that one can run, for example:

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lsof -c htop

and compare the number and nature of the files against the output of the command which opens the gnome system monitor. I'm not familiar with the gnome app but I guess it has a command to open it. If one can determine the PID of the gnome app, then the results of the lsof command can also be obtained from:

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lsof -p <PID-of-gnome-app>