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289 lines
12 KiB
XML
289 lines
12 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</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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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, or 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>.
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If <command>systemd-cgtop</command> is not connected
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to a tty, only one iteration is performed and no
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columns headers are printed. This mode is suitable for
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scripting.</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-system.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>--version</option></term>
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<listitem><para>Prints a version string and
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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>-b</option></term>
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<term><option>--batch</option></term>
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<listitem><para>Run in "batch" mode:
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do not accept input and run until the
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iteration limit set with
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<option>--iterations</option> is
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exhausted or until killed. This mode
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could be useful for sending output
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from <command>systemd-cgtop</command>
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to other programs or to a
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file.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-n</option></term>
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<term><option>--iterations=</option></term>
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<listitem><para>Perform only this many
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iterations.</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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3.</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>Sort the control groups
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by path, number of tasks, CPU load,
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memory usage, or IO
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load, respectively.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>%</term>
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<listitem><para>Toggle between showing CPU time as
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time or percentage.</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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or decrease refresh
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delay, respectively.</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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