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[systemd.git] / man / systemd-cgtop.xml

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  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

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<refentry id="systemd-cgtop"
    xmlns:xi="http://www.w3.org/2001/XInclude">

  <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</command>
      <arg choice="opt" rep="repeat">OPTIONS</arg>
    </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, or disk I/O load. The display is refreshed in
    regular intervals (by default every 1s), similar in style to
    <citerefentry project='man-pages'><refentrytitle>top</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>

    <para>If <command>systemd-cgtop</command> is not connected to a
    tty, no column headers are printed and the default is to only run
    one iteration.  The <varname>--iterations=</varname> argument, if
    given, is honored. This mode is suitable for scripting.</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>. If resource monitoring for
    these resources is required, it is recommended to add the
    <varname>CPUAccounting=1</varname>,
    <varname>MemoryAccounting=1</varname> and
    <varname>BlockIOAccounting=1</varname> settings in the unit files
    in question. See
    <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
    for details.</para>

    <para>The CPU load value can be between 0 and 100 times the number of
    processors the system has. For example, if the system has 8 processors,
    the CPU load value is going to be between 0% and 800%. The number of
    processors can be found in <literal>/proc/cpuinfo</literal>.</para>

    <para>To emphasize this: unless
    <literal>CPUAccounting=1</literal>,
    <literal>MemoryAccounting=1</literal> and
    <literal>BlockIOAccounting=1</literal> are enabled for the
    services in question, 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>-p</option></term>
        <term><option>--order=path</option></term>

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

      <varlistentry>
        <term><option>-t</option></term>
        <term><option>--order=tasks</option></term>

        <listitem><para>Order by number of processes in control group.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>-c</option></term>
        <term><option>--order=cpu</option></term>

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

      <varlistentry>
        <term><option>-m</option></term>
        <term><option>--order=memory</option></term>

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

      <varlistentry>
        <term><option>-i</option></term>
        <term><option>--order=io</option></term>

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

      <varlistentry>
        <term><option>-b</option></term>
        <term><option>--batch</option></term>

        <listitem><para>Run in "batch" mode: do not accept input and
        run until the iteration limit set with
        <option>--iterations=</option> is exhausted or until killed.
        This mode could be useful for sending output from
        <command>systemd-cgtop</command> to other programs or to a
        file.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>-r</option></term>
        <term><option>--raw</option></term>

	<listitem><para>Format byte counts (as in memory usage and IO metrics)
	with raw numeric values rather than human-readable
        numbers.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--cpu=percentage</option></term>
        <term><option>--cpu=time</option></term>

        <listitem><para>Controls whether the CPU usage is shown as
        percentage or time. By default the CPU usage is shown as
        percentage. This setting may also be toggled at runtime by
        pressing the <keycap>%</keycap> key.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>-k</option></term>

        <listitem><para>Include kernel threads when counting tasks in
        control groups. By default, kernel threads are not included in
        the count. This setting may also be toggled at runtime by
        pressing the <keycap>k</keycap> key.</para></listitem>
      </varlistentry>

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

        <listitem><para>Controls whether the number of tasks shown for
        a control group shall include all tasks that are contained in
        any of the child control groups as well. Takes a boolean
        argument, defaults to <literal>yes</literal>. If enabled the
        tasks in child control groups are included, if disabled only
        the tasks in the control group itself are counted. This
        setting may also be toggled at runtime by pressing the
        <keycap>r</keycap> key.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>-n</option></term>
        <term><option>--iterations=</option></term>

        <listitem><para>Perform only this many iterations. A value of
        0 indicates that the program should run
        indefinitely.</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). This setting may also be increased and decreased at
        runtime by pressing the <keycap>+</keycap> and
        <keycap>-</keycap> keys.</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
        3.</para></listitem>
      </varlistentry>

      <xi:include href="standard-options.xml" xpointer="help" />
      <xi:include href="standard-options.xml" xpointer="version" />
    </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><keycap>h</keycap></term>

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

      <varlistentry>
        <term><keycap function="space"/></term>

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

      <varlistentry>
        <term><keycap>q</keycap></term>

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

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

        <listitem><para>Sort the control groups by path, number of
        tasks, CPU load, memory usage, or IO load, respectively.  This
        setting may also be controlled using the
        <option>--order=</option> command line
        switch.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><keycap>%</keycap></term>

        <listitem><para>Toggle between showing CPU time as time or
        percentage. This setting may also be controlled using the
        <option>--cpu=</option> command line switch.</para></listitem>
      </varlistentry>

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

        <listitem><para>Increase or decrease refresh delay,
        respectively. This setting may also be controlled using the
        <option>--delay=</option> command line
        switch.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><keycap>k</keycap></term>

        <listitem><para>Toggle between including or excluding kernel
        threads in control group task counts. This setting may also be
        controlled using the <option>-k</option> command line
        switch.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><keycap>r</keycap></term>

        <listitem><para>Toggle between recursively including or
        excluding tasks in child control groups in control group task
        counts. This setting may also be controlled using the
        <option>--recursive=</option> command line
        switch.</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>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
      <citerefentry project='man-pages'><refentrytitle>top</refentrytitle><manvolnum>1</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>