cddl/contrib/dtracetoolkit/Examples/readdist_example.txt

   1 The following is an example of the readdist.d script,
   2
   3
   4 Here the readdist.d script is run for a few seconds, then Ctrl-C is hit,
   5
   6    # readdist.d
   7    dtrace: description 'sysinfo:::readch ' matched 4 probes
   8    ^C
   9    [...]
  10      gnome-terminal
  11               value  ------------- Distribution ------------- count
  12                  16 |                                         0
  13                  32 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@   15
  14                  64 |@@@                                      1
  15                 128 |                                         0
  16
  17      Xorg
  18               value  ------------- Distribution ------------- count
  19                  -1 |                                         0
  20                   0 |@@@@@@@@@@@@@@@@@@@                      26
  21                   1 |                                         0
  22                   2 |                                         0
  23                   4 |                                         0
  24                   8 |@@@@                                     6
  25                  16 |@                                        2
  26                  32 |@                                        2
  27                  64 |                                         0
  28                 128 |@@@@@@@@                                 11
  29                 256 |@@@                                      4
  30                 512 |                                         0
  31
  32 This allows us to understand the read behaviour of each process. The
  33 Xorg command has executed 26 reads that returned 0 bytes, through
  34 to 4 reads that were at least 256 bytes (up to 511).
  35