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  1. $ dd if=/dev/urandom of=somefile.txt bs=1M count=200
  2. 200+0 records in
  3. 200+0 records out
  4. 209715200 bytes (210 MB, 200 MiB) copied, 1,31332 s, 160 MB/s
  5.  
  6.  
  7.  
  8. $ vmstat 1 1000
  9. procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
  10.  r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
  11.  0  0     64 2659604 383244 3596884    0    0     3    47   34   14 27  7 66  0  0
  12.  1  0     64 2509432 383244 3746080    0    0     0     0 1005 2278  5 20 75  0  0
  13.  0  0     64 2452560 383248 3807932    0    0     4 204880 1175 2321  4 12 75  9  0
  14.  0  0     64 2453144 383248 3807548    0    0     0     0  814 2677  5  2 93  0  0
  15.  1  0     64 2444868 383248 3814516    0    0     0   244  529 1746  4  2 94  0  0
  16.  0  0     64 2445756 383248 3814516    0    0     0     0  495 1957  3  1 96  0  0
  17.    
  18. $ dd if=/dev/urandom of=somefile.txt bs=1M count=200 oflag=direct
  19. 200+0 records in
  20. 200+0 records out
  21. 209715200 bytes (210 MB, 200 MiB) copied, 1,6902 s, 124 MB/s
  22.  
  23.  
  24.  
  25. $ vmstat 1 1000
  26. procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
  27.  r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
  28.  0  0     64 2623556 383248 3603572    0    0     3    47   35   14 27  7 66  0  0
  29.  1  0     64 2613784 383248 3611220    0    0     0 88064 1001 2573  5 15 79  1  0
  30.  0  0     64 2612236 383256 3611804    0    0     8 116736  912 2033  1 18 78  3  0
  31.  4  0     64 2621076 383256 3604232    0    0     0    96 1086 3250  8  3 89  0  0
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