root@nepalinux:root# vmstat 1
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  58468  56344 190700    0    0    14     7 1063   409  8  1 67 23
 0  0      0  58468  56344 190700    0    0     0     0 1406   872 12  4 84  0
 0  0      0  58452  56344 190700    0    0     0     0 1147  1485 10  5 85  0
 0  0      0  58188  56344 190700    0    0     0     0 1221  2241 32  8 60  0
 0  0      0  58188  56344 190700    0    0     0     0 1156   905  8  4 88  0
 0  0      0  58188  56348 190696    0    0     0    36 1058   167  4  1 95  0
 0  0      0  58188  56348 190696    0    0     0     0 1220   369  8  1 91  0
 0  0      0  58188  56348 190696    0    0     0     0 1270   436 10  3 87  0
 0  0      0  58188  56348 190696    0    0     0     0 1265   395  7  2 91  0
 0  0      0  57568  56348 190696    0    0     0     0 1049   369 25  4 71  0
 0  0      0  57320  56348 190696    0    0     0     0 1062   106 12  1 87  0
 0  0      0  57320  56348 190696    0    0     0     0 1036    58  0  0 100  0
 0  0      0  57212  56348 190696    0    0     0     0 1052    85  0  1 99  0

--

Free o/p:
root@nepalinux:root# free -
             total       used       free     shared    buffers     cached
Mem:        507604     449756      57848          0      56424     191096
-/+ buffers/cache:     202236     305368
Swap:       248996          0     248996


 0  0      0  57212  56348 190696    0    0     0     0 1044   109  1  1 98  0
 0  0      0  57212  56356 190688    0    0     0   328 1096   139  0  1 98  1
 0  0      0  57088  56356 190688    0    0     0     0 1153   557 10  4 86  0
 0  0      0  57104  56356 190688    0    0     0     0 1139   682  9  2 89  0
 0  0      0  56980  56356 190688    0    0     0     0 1095   176  6  1 93  0
 0  1      0  56964  56356 190688    0    0     0     0 1231   412  8  3  4 85
 1  0      0  56452  56356 190688    0    0     0     0 1133   390 24  2  0 74
 1  0      0  55584  56364 190680    0    0     0   132 1328   512 35  5 60  0
 8  0      0  53228  56364 191088    0    0     0     0 1146  2032 79 11 10  0
 0  0      0  52856  56364 191224    0    0     0     0 1233  1532 61  7 32  0
 2  0      0  51724  56368 191424    0    0   204     0 1081   983 28  7 65  0
 0  0      0  51352  56368 191560    0    0   100     0 1169   502 15  5 79  1
 0  0      0  51352  56372 191556    0    0     0   808 1038   120  2  2 94  2
 0  0      0  51352  56372 191556    0    0     0     0 1040   103  1  0 99  0
 0  0      0  51228  56372 191556    0    0     0     0 1038    79  0  1 99  0
 0  0      0  51260  56372 191556    0    0     0     0 1383  1029 23  4 73  0
 0  0      0  51260  56372 191556    0    0     0     0 1274   815 19  5 76  0
 0  0      0  51244  56380 191548    0    0     0    40 1292   784 15  3 63 19
 0  0      0  50624  56380 191548    0    0    24     0 1081   985 53  5 40  2
 0  0      0  55104  56380 191208    0    0    32     0 1401   522 33  9 56  2