procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 1  0      0 304468  29828 496424    0    0   451   235 1129  295 10  2 85  3
 2  0      0 299260  29828 496492    0    0     8     0 1311  823 54 25 21  0
 2  0      0 300128  29828 496492    0    0     0     0 1152 1876 80 20  0  0
 1  0      0 299988  29852 496468    0    0     0   616 1335 2941 90 10  0  0
 1  0      0 298748  29852 496468    0    0     0     0 1109 2904 92  8  0  0