$ 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 <— update (secs) 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