vmstat

root@server:~/codes# vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
19  0      0 29684012  86112 1689844    0    0    19   590  254  231 48  0 47  5
23  0      0 29704812  86128 1697672    0    0     4   320 11100 8121 77  1 22  0
33  0      0 29671044  86156 1705308    0    0     0  5440 13190 9140 95  1  4  0
33  3      0 29670088  86160 1706288    0    0     0 32932 12275 7297 99  0  1  0
35  0      0 29693456  86188 1710724    0    0     4   676 12701 7867 98  1  1  0
^C