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GNU/Linux |
Debian 7.3.0(Wheezy) |
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iotop(8) |
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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, CONFIG_TASK_IO_ACCOUNTING, CONFIG_TASKSTATS and CONFIG_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 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.
−−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.
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−q |
column names are only printed on the first iteration, | ||
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column names are never printed, | ||
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−qqq |
the I/O summary is never printed. |
ionice(1), top(1), vmstat(1), atop(1), htop(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.
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iotop(8) | |