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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
        "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

<!--
  This file is part of systemd.

  Copyright 2012 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
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  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->

<refentry id="systemd-cgtop">

        <refentryinfo>
                <title>systemd-cgtop</title>
                <productname>systemd</productname>

                <authorgroup>
                        <author>
                                <contrib>Developer</contrib>
                                <firstname>Lennart</firstname>
                                <surname>Poettering</surname>
                                <email>lennart@poettering.net</email>
                        </author>
                </authorgroup>
        </refentryinfo>

        <refmeta>
                <refentrytitle>systemd-cgtop</refentrytitle>
                <manvolnum>1</manvolnum>
        </refmeta>

        <refnamediv>
                <refname>systemd-cgtop</refname>
                <refpurpose>Show top control groups by their resource usage</refpurpose>
        </refnamediv>

        <refsynopsisdiv>
                <cmdsynopsis>
                        <command>systemd-cgtop <arg choice="opt" rep="repeat">OPTIONS</arg></command>
                </cmdsynopsis>
        </refsynopsisdiv>

        <refsect1>
                <title>Description</title>

                <para><command>systemd-cgtop</command> shows the top
                control groups of the local Linux control group
                hierarchy, ordered by their CPU, memory and disk I/O load. The
                display is refreshed in regular intervals (by default
                every 1s), similar in style to
                <citerefentry><refentrytitle>top</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>

                <para>Resource usage is only accounted for control
                groups in the relevant hierarchy, i.e. CPU usage is
                only accounted for control groups in the
                <literal>cpuacct</literal> hierarchy, memory usage
                only for those in <literal>memory</literal> and disk
                I/O usage for those in
                <literal>blkio</literal>. <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                by default places all services in their own control
                group in the <literal>cpuacct</literal> hierarchy, but
                not in <literal>memory</literal> nor
                <literal>blkio</literal>. If resource monitoring for
                these resources is required it is recommended to add
                <literal>blkio</literal> and <literal>memory</literal>
                to the <varname>DefaultControllers=</varname> setting
                in <filename>/etc/systemd/system.conf</filename> (see
                <citerefentry><refentrytitle>systemd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
                for details). Alternatively, it is possible to enable
                resource accounting individually for services, by
                making use of the <varname>ControlGroup=</varname>
                option in the unit files (See
                <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
                for details).</para>

                <para>To emphasize this: unless
                <literal>blkio</literal> and <literal>memory</literal>
                are enabled for the services in question with either
                of the options suggested above no resource accounting
                will be available for system services and the data shown
                by <command>systemd-cgtop</command> will be
                incomplete.</para>
        </refsect1>

        <refsect1>
                <title>Options</title>

                <para>The following options are understood:</para>

                <variablelist>
                        <varlistentry>
                                <term><option>-h</option></term>
                                <term><option>--help</option></term>

                                <listitem><para>Prints a short help
                                text and exits.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-p</option></term>

                                <listitem><para>Order by control group
                                path name.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-t</option></term>

                                <listitem><para>Order by number of
                                tasks in control
                                group (i.e. threads and processes).</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-c</option></term>

                                <listitem><para>Order by CPU load.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-m</option></term>

                                <listitem><para>Order by memory usage.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-i</option></term>

                                <listitem><para>Order by disk I/O load.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-d</option></term>
                                <term><option>--delay=</option></term>

                                <listitem><para>Specify refresh delay
                                in seconds (or if one of
                                <literal>ms</literal>,
                                <literal>us</literal>,
                                <literal>min</literal> is specified as
                                unit in this time
                                unit).</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--depth=</option></term>

                                <listitem><para>Maximum control group
                                tree traversal depth. Specifies how
                                deep <command>systemd-cgtop</command>
                                shall traverse the control group
                                hierarchies. If 0 is specified only
                                the root group is monitored, for 1
                                only the first level of control groups
                                is monitored, and so on. Defaults to
                                2.</para></listitem>
                        </varlistentry>

                </variablelist>

        </refsect1>


        <refsect1>
                <title>Keys</title>

                <para><command>systemd-cgtop</command> is an
                interactive tool and may be controlled via user input
                using the following keys:</para>

                <variablelist>
                        <varlistentry>
                                <term>h</term>

                                <listitem><para>Shows a short help text.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term>SPACE</term>

                                <listitem><para>Immediately refresh output.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term>q</term>

                                <listitem><para>Terminate the program.</para></listitem>
                        </varlistentry>


                        <varlistentry>
                                <term>p</term>
                                <term>t</term>
                                <term>c</term>
                                <term>m</term>
                                <term>i</term>

                                <listitem><para>Change ordering of control groups
                                by path, number of tasks, CPU load,
                                memory usage resp. IO
                                load.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term>+</term>
                                <term>-</term>

                                <listitem><para>Increase,
                                resp. decrease refresh
                                delay.</para></listitem>
                        </varlistentry>

                </variablelist>
        </refsect1>

        <refsect1>
                <title>Exit status</title>

                <para>On success 0 is returned, a non-zero failure
                code otherwise.</para>
        </refsect1>

        <refsect1>
                <title>See Also</title>
                <para>
                        <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>systemd-cgls</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>top</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                </para>
        </refsect1>

</refentry>