iotop


SYNOPSIS
       iotop [OPTIONS]

DESCRIPTION
       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   CON-
       FIG_TASK_DELAY_ACCT,  CONFIG_TASK_IO_ACCOUNTING,  CONFIG_TASKSTATS  and
       CONFIG_VM_EVENT_COUNTERS  options need to be enabled in your Linux ker-
       nel build configuration.

       iotop displays columns for the I/O bandwidth read and written  by  each
       process/thread  during  the  sampling period. It also displays the per-
       centage 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  --pro-
       cesses  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.

OPTIONS
       --version
              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  tog-
              gled by pressing o.

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

       -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)
              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.

SEE ALSO
       ionice(1), top(1), vmstat(1), atop(1), htop(1)

AUTHOR
       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(8)
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