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if you are running low on memory why is gdmgreeter running ?
I think you can close down X altogether and work on text based system (if the system is not going to serve any graphical purpose)
'gdmgreeter' seems to consume a lot of memory sometimes. Killing it will not help, it will be restarted. Maybe remove it from the system (don't know if possible, gnome might need it).
You can also check for many other services running in the background, that can be switched off completely. Keep only what is really needed.
Consider switching the X Window Manager to XFCE, needs less resources.
#kill -9 6448 but again it goes displaying..
How I gonna kill that?
Try finding what is in the /etc/inittab
and if the GDM greeter is set to re-start in that runlevel, then, howmuch ever you kill it, it will get re-started
Try changing the runlevel to someother than the current (but not 0 or 6 )
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