man iotop Command

Man page for apt-get iotop Command

Man Page for iotop in Linux

Ubuntu Man Command : man iotop

Man Iotop  Command

This tutorial shows the man page for man iotop in linux.

Open terminal with 'su' access and type the command as shown below:
man iotop

Result of the Command Execution shown below:

IOTOP(1)                                                                                                                                                    IOTOP(1)

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 band Äê
width 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 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.

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)-

Related Topics

Apt Get Commands