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How tmpfs works in Debian?

How tmpfs works in Debian?

I run df -h and found on my Debian Squeeze two tmpfs directory,

Asked by: Guest | Views: 64
Total answers/comments: 1
Guest [Entry]

"My physical memory's size is 3GB. I wonder: Is the three tmpfs either all resided on the memory(Is that possible?) or extended to the swap?

tmpfs only uses memory when you fill it with files. So as long as it is empty, it will take almost no space in RAM."