$ vmstat 2 20
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
37  3  62768 369728 329080 6315536    0    0     0     6    0    0  8  0 92  0  0
40  0  62768 430356 329080 6315420    0    0     0    86 27305 9211 96  3  1  0  0
37  0  62768 426024 329080 6315428    0    0     0     0 24632 6733 98  2  0  0  0
38  1  62768 414368 329080 6315436    0    0     0     8 25024 6717 98  2  0  0  0
31  0  62768 373828 329084 6315440    0    0     0    62 24578 6477 97  2  1  0  0
33  0  62768 404016 329084 6315444    0    0     0   348 25252 7493 95  2  2  1  0
34  0  62768 401508 329088 6315560    0    0     0    46 25392 7085 97  2  1  0  0
32  0  62768 400996 329088 6315576    0    0     0     0 25860 7565 97  2  1  0  0
33  0  62768 385920 329088 6315588    0    0     0    62 25969 7512 96  2  2  0  0
38  0  62768 375628 329092 6315596    0    0     0    62 25362 6995 97  2  1  0  0
37  0  62768 319960 329092 6315704    0    0     0     2 24897 6506 98  2  0  0  0
37  0  62768 355300 329092 6315664    0    0     0     0 26884 8337 95  2  2  1  0
34  3  62768 353408 329092 6315704    0    0     0   116 30260 11883 91  2  5  2  0