5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
247 lines
10 KiB
XML
247 lines
10 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-cgtop">
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<refentryinfo>
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<title>systemd-cgtop</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-cgtop</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-cgtop</refname>
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<refpurpose>Show top control groups by their resource usage</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-cgtop <arg choice="opt" rep="repeat">OPTIONS</arg></command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd-cgtop</command> shows the top
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control groups of the local Linux control group
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hierarchy, ordered by their CPU, memory and disk I/O load. The
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display is refreshed in regular intervals (by default
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every 1s), similar in style to
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<citerefentry><refentrytitle>top</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
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<para>Resource usage is only accounted for control
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groups in the relevant hierarchy, i.e. CPU usage is
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only accounted for control groups in the
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<literal>cpuacct</literal> hierarchy, memory usage
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only for those in <literal>memory</literal> and disk
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I/O usage for those in
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<literal>blkio</literal>. <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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by default places all services in their own control
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group in the <literal>cpuacct</literal> hierarchy, but
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not in <literal>memory</literal> nor
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<literal>blkio</literal>. If resource monitoring for
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these resources is required it is recommended to add
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<literal>blkio</literal> and <literal>memory</literal>
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to the <varname>DefaultControllers=</varname> setting
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in <filename>/etc/systemd/system.conf</filename> (see
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<citerefentry><refentrytitle>systemd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details). Alternatively, it is possible to enable
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resource accounting individually for services, by
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making use of the <varname>ControlGroup=</varname>
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option in the unit files (See
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details).</para>
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<para>To emphasize this: unless
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<literal>blkio</literal> and <literal>memory</literal>
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are enabled for the services in question with either
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of the options suggested above no resource accounting
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will be available for system services and the data shown
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by <command>systemd-cgtop</command> will be
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incomplete.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>-h</option></term>
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<term><option>--help</option></term>
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<listitem><para>Prints a short help
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text and exits.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-p</option></term>
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<listitem><para>Order by control group
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path name.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-t</option></term>
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<listitem><para>Order by number of
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tasks in control
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group (i.e. threads and processes).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-c</option></term>
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<listitem><para>Order by CPU load.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-m</option></term>
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<listitem><para>Order by memory usage.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-i</option></term>
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<listitem><para>Order by disk I/O load.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-d</option></term>
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<term><option>--delay=</option></term>
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<listitem><para>Specify refresh delay
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in seconds (or if one of
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<literal>ms</literal>,
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<literal>us</literal>,
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<literal>min</literal> is specified as
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unit in this time
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unit).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--depth=</option></term>
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<listitem><para>Maximum control group
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tree traversal depth. Specifies how
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deep <command>systemd-cgtop</command>
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shall traverse the control group
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hierarchies. If 0 is specified only
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the root group is monitored, for 1
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only the first level of control groups
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is monitored, and so on. Defaults to
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2.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Keys</title>
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<para><command>systemd-cgtop</command> is an
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interactive tool and may be controlled via user input
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using the following keys:</para>
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<variablelist>
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<varlistentry>
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<term>h</term>
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<listitem><para>Shows a short help text.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>SPACE</term>
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<listitem><para>Immediately refresh output.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>q</term>
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<listitem><para>Terminate the program.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>p</term>
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<term>t</term>
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<term>c</term>
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<term>m</term>
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<term>i</term>
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<listitem><para>Change ordering of control groups
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by path, number of tasks, CPU load,
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memory usage resp. IO
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load.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>+</term>
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<term>-</term>
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<listitem><para>Increase,
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resp. decrease refresh
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delay.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success 0 is returned, a non-zero failure
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code otherwise.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-cgls</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>top</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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