My laptop running
Ubuntu 12.04 has 8GB RAM. I added following record to
tmpfs /media/ramdisk tmpfs defaults,noatime,mode=1777 0 0
What exactly does it mean? I have tested that I can save 4GB to ram disk at most. Why exactly 4GB? Where did the computer get this number from?
What happens when I don't use that ram disk for a while and when the directory /media/ramdisk is empty? Does it mean that my system can use whole 8GB ram?
And what happens when the system runs out of ram? Will the most rarely used things be moved to swap?
And should I turn off swap if I think my system will never need it? Will turning off the swap make my computer faster? And can I even remove the swap partition? And will the hibernation work correctly then?