iotop(1)

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_TASKSTATS and CONFIG_TASK_IO_ACCOUNTING 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 during the sampling period. It also displays the percentage of time the thread/process spent while swapping in and while waiting on I/O. 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 or q to quit. 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 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.

SEE ALSO

top(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.

May 2008 IOTOP(1)