Provided by: iotop_0.4-1_all bug


       iotop - simple top-like I/O monitor


       iotop [OPTIONS]


       iotop  watches  I/O  usage  information  output  by  the  Linux  kernel
       (requires 2.6.20 or later) and displays a table of current I/O usage by
       processes or threads on the system. At least the CONFIG_TASK_DELAY_ACCT
       and CONFIG_TASK_IO_ACCOUNTING options need to be enabled in your  Linux
       kernel build configuration, these options depend on CONFIG_TASKSTATS.

       iotop  displays  columns for the I/O bandwidth read and written by each
       process/thread  during  the  sampling  period.  It  also  displays  the
       percentage of time the thread/process spent while swapping in and while
       waiting on I/O. For each process, its  I/O  priority  (class/level)  is
       shown.   In  addition,  the total I/O bandwidth read and written during
       the sampling period is displayed at the top of the interface.

       Use the left and right arrows to change the sorting, r to  reverse  the
       sorting  order,  o  to  toggle  the  --only  option,  p  to  toggle the
       --processes option, a to toggle the --accumulated option, q to quit  or
       i to change the priority of a thread or a process’ thread(s). Any other
       key will force a refresh.


              Show the version number and exit

       -h, --help
              Show usage information and exit

       -o, --only
              Only show processes or threads actually doing  I/O,  instead  of
              showing  all  processes  or  threads.  This  can  be dynamically
              toggled by pressing o.

       -b, --batch
              Turn on non-interactive mode.  Useful for logging I/O usage over

       -n NUM, --iter=NUM
              Set  the  number  of  iterations  before quitting (never quit by
              default).  This is most useful in non-interactive mode.

       -d SEC, --delay=SEC
              Set the  delay  between  iterations  in  seconds  (1  second  by
              default).  Accepts non-integer values such as 1.1 seconds.

       -p PID, --pid=PID
              A list of processes/threads to monitor (all by default).

       -u USER, --user=USER
              A list of users to monitor (all by default)

       -P, --processes
              Only show processes. Normally iotop shows all threads.

       -a, --accumulated
              Show  accumulated  I/O instead of bandwidth. In this mode, iotop
              shows the amount of I/O processes have done since iotop started.

       -k, --kilobytes
              Use  kilobytes  instead  of  a human friendly unit. This mode is
              useful when scripting  the  batch  mode  of  iotop.  Instead  of
              choosing  the most appropriate unit iotop will display all sizes
              in kilobytes.

       -t, --time
              Add a timestamp on each line (implies --batch). Each  line  will
              be prefixed by the current time.

       -q, --quiet
              suppress some lines of header (implies --batch). This option can
              be specified up to three times to remove header lines.
              -q     column names are only printed on the first iteration,
              -qq    column names are never printed,
              -qqq   the I/O summary is never printed.


       ionice(1), top(1), vmstat(1)


       iotop was written by Guillaume Chazarain.

       This manual page was started by Paul Wise for the Debian project and is
       placed in the public domain.

                                  April 2009                          IOTOP(1)