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ntop 3.3.9 (Default branch)
12-14-2008
ntop is a network probe that shows network usage in a way similar to what top does for processes. In interactive mode, it displays the network status on the user's terminal. In Web mode, it acts as a Web server, creating an HTML dump of the network status. It sports a NetFlow/sFlow emitter/collector, an HTTP-based client interface for creating ntop-centric monitoring applications, and RRD for persistently storing traffic statistics. License: GNU General Public License (GPL) Changes:|
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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 pro- cesses or threads on the system. At least the CONFIG_TASK_DELAY_ACCT, CONFIG_TASK_IO_ACCOUNTING, CONFIG_TASKSTATS and CONFIG_VM_EVENT_COUN- TERS 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 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 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 public domain. April 2009 IOTOP(8)