cddl/contrib/dtracetoolkit/Examples/writedist_example.txt

   1 The following is an example of the writedist.d script,
   2
   3
   4 Here the writedist.d script is run for a few seconds, then Ctrl-C is hit,
   5
   6    # writedist.d
   7    dtrace: description 'sysinfo:::writech ' matched 4 probes
   8    ^C
   9    [...]
  10      Xorg
  11               value  ------------- Distribution ------------- count
  12                  16 |                                         0
  13                  32 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@       169
  14                  64 |@@@                                      16
  15                 128 |@@                                       10
  16                 256 |                                         0
  17
  18      gnome-terminal
  19               value  ------------- Distribution ------------- count
  20                   0 |                                         0
  21                   1 |@@                                       6
  22                   2 |                                         0
  23                   4 |                                         0
  24                   8 |                                         1
  25                  16 |@                                        2
  26                  32 |@@@                                      7
  27                  64 |                                         0
  28                 128 |@@@@@@@@@@@@@@@@@@@@@@@                  63
  29                 256 |@@@@                                     10
  30                 512 |                                         1
  31                1024 |@@@@@                                    13
  32                2048 |@                                        2
  33                4096 |@@@                                      7
  34
  35 This allows us to understand the write behaviour of each process. The
  36 gnome-terminal command has executed 6 writes that returned 0 bytes, through
  37 to 7 writes that were at least 4096 bytes (up to 8192).
  38