vmstat

# vmstat 1 1000
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 0  0 299860 110720 579052 1277164    0    0     7    41   15   16  2  0 97  0
 0  0 299860 110720 579052 1277164    0    0     0     0   86  105  0  0 100  0