(raw) Oracle Linux 6 memory foorprint with/out X11


Running quite a couple of (Linux) guests on a virtual host sooner or later raises the question of the (guests / host resources) ratio. That is, commonly for cpu, ram and i/o, how many guests will fit on that specific host for an average load.

Having this question nagging in my head, I was particularly curious to find out how much memory an OL6 will consume for a pure operating system installation with and without the convenience of running X11 (which is animated by Gnome 3.x in OL6, having most of the autostart apps removed – xfce will be much leaner but that’s another story).

The top Mem: used snapshots were taken immediately after a bounce of the guest to have as less application code inference as possible since Linux never frees memory iff not necessary. Here we go.

  • OL6 no X11:
  • OL6 with X11, not yet “gnomed” (logged in grahically), seen from tty2:
  • OL6 with X11, once “gnomed” (logging in grahically) but having done nothing further, seen from tty2:

Still curious to know the number after an approximate runtime of 1 hour of doing nothing? The effect of all the servoces and tools that run in the background? You’re like me, again we go.

  • OL6 no X11, after 1 hour of doing nothing:
  • OL6 with X11, once “gnomed” (logging in grahically) but having done nothing further, seen from tty2, after 1 hour of doing nothing:

Jep, this is lightyears away from testing thouroughly, given the Linux shared memory feature and things but it gives a (raw) idea of the buck for the X11 bang.

Have fun

P

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