> From what I understand, Linux memory isn't freed up until it is full.
> Is there a way to find out how much memory is actively in use?

The free command.

$ free
             total       used       free     shared    buffers     cached
Mem:       1028164     928764      99400          0      28228     468768
-/+ buffers/cache:     431768     596396
Swap:      1556168     210476    1345692

That looks like the exact same info top gives me.  I have 2GB in my
server and I'm trying to figure out if I could get away with 1GB
without swapping.  Is there a tool that can help me figure that out?

- Grant
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