cddl/contrib/dtracetoolkit/Examples/bitesize_example.txt

   1 In this example, bitesize.d was run for several seconds then Ctrl-C was hit.
   2 As bitesize.d runs it records how processes on the system are accessing the
   3 disks - in particular the size of the I/O operation. It is usually desirable
   4 for processes to be requesting large I/O operations rather than taking many
   5 small "bites".
   6
   7 The final report highlights how processes performed. The find command mostly
   8 read 1K blocks while the tar command was reading large blocks - both as
   9 expected.
  10
  11    # bitesize.d
  12    Tracing... Hit Ctrl-C to end.
  13    ^C
  14
  15         PID  CMD
  16        7110  -bash\0
  17
  18               value  ------------- Distribution ------------- count
  19                 512 |                                         0
  20                1024 |@@@@@@@@@@@@@@@@@@@@@@@@@@               2
  21                2048 |                                         0
  22                4096 |@@@@@@@@@@@@@                            1
  23                8192 |                                         0
  24
  25        7110  sync\0
  26
  27               value  ------------- Distribution ------------- count
  28                 512 |                                         0
  29                1024 |@@@@@                                    1
  30                2048 |@@@@@@@@@@                               2
  31                4096 |                                         0
  32                8192 |@@@@@@@@@@@@@@@@@@@@@@@@@                5
  33               16384 |                                         0
  34
  35           0  sched\0
  36
  37               value  ------------- Distribution ------------- count
  38                1024 |                                         0
  39                2048 |@@@                                      1
  40                4096 |                                         0
  41                8192 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@     10
  42               16384 |                                         0
  43
  44        7109  find /\0
  45
  46               value  ------------- Distribution ------------- count
  47                 512 |                                         0
  48                1024 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@       1452
  49                2048 |@@                                       91
  50                4096 |                                         33
  51                8192 |@@                                       97
  52               16384 |                                         0
  53
  54           3  fsflush\0
  55
  56               value  ------------- Distribution ------------- count
  57                4096 |                                         0
  58                8192 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 449
  59               16384 |                                         0
  60
  61        7108  tar cf /dev/null /\0
  62
  63               value  ------------- Distribution ------------- count
  64                 256 |                                         0
  65                 512 |                                         70
  66                1024 |@@@@@@@@@@                               1306
  67                2048 |@@@@                                     569
  68                4096 |@@@@@@@@@                                1286
  69                8192 |@@@@@@@@@@                               1403
  70               16384 |@                                        190
  71               32768 |@@@                                      396
  72               65536 |                                         0
  73
  74