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IOTOP(8) System Manager's Manual IOTOP(8)
NAME
iotop - simple top-like I/O monitor
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 CONFIG_TASK_DELAY_ACCT, CONFIG_TASK_IO_ACCOUNTING, CONFIG_TASKSTATS and CON-
FIG_VM_EVENT_COUNTERS options need to be enabled in your Linux kernel build configuration.
iotop displays columns for the I/O bandwidth read and written by each process/thread dur-
ing 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 dis-
played at the top of the interface. Total DISK READ and Total DISK WRITE values represent
total read and write bandwidth between processes and kernel threads on the one side and
kernel block device subsystem on the other. While Actual DISK READ and Actual DISK WRITE
values represent corresponding bandwidths for actual disk I/O between kernel block device
subsystem and underlying hardware (HDD, SSD, etc.). Thus Total and Actual values may not
be equal at any given moment of time due to data caching and I/O operations reordering
that take place inside Linux kernel.
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 --accumu-
lated 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 toggled 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)
-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.
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 pub-
lic domain.
April 2009 IOTOP(8)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
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