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free

$ free
             total       used       free     shared    buffers     cached
Mem:       3103512     778880    2324632          0     103256     430624
-/+ buffers/cache:     245000    2858512
Swap:      2249060          0    2249060
(before/after running program)

vmstat

$ vmstat 3
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 0  0      0 2325896 103308 430620    0    0    16     9   64  194  1  0 98  0
Use free right before running a program, like before you start Firefox.

Run a while, load some tabs, do some stuff, then run free again.

See how much your system memory changes.




The important field in free is ...

[flip]