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360 lines
13 KiB
XML
360 lines
13 KiB
XML
<?xml version='1.0'?>
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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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SPDX-License-Identifier: LGPL-2.1+
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-->
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<refentry id="systemd-cgtop"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-cgtop</title>
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<productname>systemd</productname>
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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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<arg choice="opt">GROUP</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 control
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groups of the local Linux control group hierarchy, ordered by
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their CPU, memory, or disk I/O load. The display is refreshed in
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regular intervals (by default every 1s), similar in style to
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<citerefentry project='man-pages'><refentrytitle>top</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
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If a control group path is specified, shows only the services of
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the specified control group.</para>
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<para>If <command>systemd-cgtop</command> is not connected to a
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tty, no column headers are printed and the default is to only run
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one iteration. The <varname>--iterations=</varname> argument, if
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given, is honored. This mode is suitable for scripting.</para>
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<para>Resource usage is only accounted for control groups in the
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relevant hierarchy, i.e. CPU usage is only accounted for control
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groups in the <literal>cpuacct</literal> hierarchy, memory usage
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only for those in <literal>memory</literal> and disk I/O usage for
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those in <literal>blkio</literal>. If resource monitoring for
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these resources is required, it is recommended to add the
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<varname>CPUAccounting=1</varname>,
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<varname>MemoryAccounting=1</varname> and
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<varname>BlockIOAccounting=1</varname> settings in the unit files
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in question. See
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details.</para>
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<para>The CPU load value can be between 0 and 100 times the number of
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processors the system has. For example, if the system has 8 processors,
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the CPU load value is going to be between 0% and 800%. The number of
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processors can be found in <literal>/proc/cpuinfo</literal>.</para>
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<para>To emphasize this: unless
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<literal>CPUAccounting=1</literal>,
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<literal>MemoryAccounting=1</literal> and
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<literal>BlockIOAccounting=1</literal> are enabled for the
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services in question, no resource accounting will be available for
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system services and the data shown by
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<command>systemd-cgtop</command> will be 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>-p</option></term>
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<term><option>--order=path</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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<term><option>--order=tasks</option></term>
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<listitem><para>Order by number of tasks/processes in the control group.</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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<term><option>--order=cpu</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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<term><option>--order=memory</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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<term><option>--order=io</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: do not accept input and
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run until the iteration limit set with
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<option>--iterations=</option> is exhausted or until killed.
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This mode could be useful for sending output from
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<command>systemd-cgtop</command> 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>-r</option></term>
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<term><option>--raw</option></term>
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<listitem><para>Format byte counts (as in memory usage and I/O metrics)
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with raw numeric values rather than human-readable
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numbers.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--cpu=percentage</option></term>
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<term><option>--cpu=time</option></term>
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<listitem><para>Controls whether the CPU usage is shown as
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percentage or time. By default, the CPU usage is shown as
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percentage. This setting may also be toggled at runtime by
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pressing the <keycap>%</keycap> key.</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>Count only userspace processes instead of all
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tasks. By default, all tasks are counted: each kernel thread
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and each userspace thread individually. With this setting,
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kernel threads are excluded from the counting and each
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userspace process only counts as one, regardless how many
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threads it consists of. This setting may also be toggled at
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runtime by pressing the <keycap>P</keycap> key. This option
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may not be combined with
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<option>-k</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-k</option></term>
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<listitem><para>Count only userspace processes and kernel
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threads instead of all tasks. By default, all tasks are
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counted: each kernel thread and each userspace thread
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individually. With this setting, kernel threads are included in
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the counting and each userspace process only counts as on one,
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regardless how many threads it consists of. This setting may
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also be toggled at runtime by pressing the <keycap>k</keycap>
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key. This option may not be combined with
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<option>-P</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--recursive=</option></term>
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<listitem><para>Controls whether the number of processes shown
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for a control group shall include all processes that are
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contained in any of the child control groups as well. Takes a
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boolean argument, which defaults to <literal>yes</literal>. If
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enabled, the processes in child control groups are included, if
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disabled, only the processes in the control group itself are
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counted. This setting may also be toggled at runtime by
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pressing the <keycap>r</keycap> key. Note that this setting
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only applies to process counting, i.e. when the
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<option>-P</option> or <option>-k</option> options are
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used. It has not effect if all tasks are counted, in which
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case the counting is always recursive.</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 iterations. A value of
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0 indicates that the program should run
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indefinitely.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-1</option></term>
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<listitem><para>A shortcut for <option>--iterations=1</option>.</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 in seconds (or if one of
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<literal>ms</literal>, <literal>us</literal>,
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<literal>min</literal> is specified as unit in this time
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unit). This setting may also be increased and decreased at
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runtime by pressing the <keycap>+</keycap> and
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<keycap>-</keycap> keys.</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 tree traversal depth.
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Specifies how deep <command>systemd-cgtop</command> shall
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traverse the control group hierarchies. If 0 is specified,
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only the root group is monitored. For 1, only the first level
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of control groups is monitored, and so on. Defaults to
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3.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-M <replaceable>MACHINE</replaceable></option></term>
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<term><option>--machine=<replaceable>MACHINE</replaceable></option></term>
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<listitem><para>Limit control groups shown to the part
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corresponding to the container
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<replaceable>MACHINE</replaceable>.
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This option may not be used when a control group path is specified.</para></listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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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 interactive tool and
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may be controlled via user input using the following keys:</para>
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<variablelist>
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<varlistentry>
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<term><keycap>h</keycap></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><keycap function="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><keycap>q</keycap></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><keycap>p</keycap></term>
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<term><keycap>t</keycap></term>
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<term><keycap>c</keycap></term>
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<term><keycap>m</keycap></term>
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<term><keycap>i</keycap></term>
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<listitem><para>Sort the control groups by path, number of
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tasks, CPU load, memory usage, or I/O load, respectively. This
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setting may also be controlled using the
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<option>--order=</option> command line
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switch.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><keycap>%</keycap></term>
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<listitem><para>Toggle between showing CPU time as time or
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percentage. This setting may also be controlled using the
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<option>--cpu=</option> command line switch.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><keycap>+</keycap></term>
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<term><keycap>-</keycap></term>
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<listitem><para>Increase or decrease refresh delay,
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respectively. This setting may also be controlled using the
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<option>--delay=</option> command line
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switch.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><keycap>P</keycap></term>
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<listitem><para>Toggle between counting all tasks, or only
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userspace processes. This setting may also be controlled using
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the <option>-P</option> command line switch (see
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above).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><keycap>k</keycap></term>
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<listitem><para>Toggle between counting all tasks, or only
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userspace processes and kernel threads. This setting may also
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be controlled using the <option>-k</option> command line
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switch (see above).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><keycap>r</keycap></term>
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<listitem><para>Toggle between recursively including or
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excluding processes in child control groups in control group
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process counts. This setting may also be controlled using the
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<option>--recursive=</option> command line switch. This key is
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not available if all tasks are counted, it is only available
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if processes are counted, as enabled with the
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<keycap>P</keycap> or <keycap>k</keycap>
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keys.</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 code
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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>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><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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