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

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

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  Copyright 2012 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
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<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>--version</option></term>

                                <listitem><para>Prints a version string 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>-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>-n</option></term>
                                <term><option>--iterations=</option></term>

                                <listitem><para>Perform only this many
                                iterations.</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
                                3.</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>
Commit	Line	Data
	1	<?xml version='1.0'?> <!---nxml--->
	2	<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
	3	"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
	4
	5	<!--
	6	This file is part of systemd.
	7
	8	Copyright 2012 Lennart Poettering
	9
	10	systemd is free software; you can redistribute it and/or modify it
	11	under the terms of the GNU Lesser General Public License as published by
	12	the Free Software Foundation; either version 2.1 of the License, or
	13	(at your option) any later version.
	14
	15	systemd is distributed in the hope that it will be useful, but
	16	WITHOUT ANY WARRANTY; without even the implied warranty of
	17	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	Lesser General Public License for more details.
	19
	20	You should have received a copy of the GNU Lesser General Public License
	21	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	22	-->
	23
	24	<refentry id="systemd-cgtop">
	25
	26	<refentryinfo>
	27	<title>systemd-cgtop</title>
	28	<productname>systemd</productname>
	29
	30	<authorgroup>
	31	<author>
	32	<contrib>Developer</contrib>
	33	<firstname>Lennart</firstname>
	34	<surname>Poettering</surname>
	35	<email>lennart@poettering.net</email>
	36	</author>
	37	</authorgroup>
	38	</refentryinfo>
	39
	40	<refmeta>
	41	<refentrytitle>systemd-cgtop</refentrytitle>
	42	<manvolnum>1</manvolnum>
	43	</refmeta>
	44
	45	<refnamediv>
	46	<refname>systemd-cgtop</refname>
	47	<refpurpose>Show top control groups by their resource usage</refpurpose>
	48	</refnamediv>
	49
	50	<refsynopsisdiv>
	51	<cmdsynopsis>
	52	<command>systemd-cgtop <arg choice="opt" rep="repeat">OPTIONS</arg></command>
	53	</cmdsynopsis>
	54	</refsynopsisdiv>
	55
	56	<refsect1>
	57	<title>Description</title>
	58
	59	<para><command>systemd-cgtop</command> shows the top
	60	control groups of the local Linux control group
	61	hierarchy, ordered by their CPU, memory and disk I/O load. The
	62	display is refreshed in regular intervals (by default
	63	every 1s), similar in style to
	64	<citerefentry><refentrytitle>top</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
	65
	66	<para>Resource usage is only accounted for control
	67	groups in the relevant hierarchy, i.e. CPU usage is
	68	only accounted for control groups in the
	69	<literal>cpuacct</literal> hierarchy, memory usage
	70	only for those in <literal>memory</literal> and disk
	71	I/O usage for those in
	72	<literal>blkio</literal>. <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
	73	by default places all services in their own control
	74	group in the <literal>cpuacct</literal> hierarchy, but
	75	not in <literal>memory</literal> nor
	76	<literal>blkio</literal>. If resource monitoring for
	77	these resources is required it is recommended to add
	78	<literal>blkio</literal> and <literal>memory</literal>
	79	to the <varname>DefaultControllers=</varname> setting
	80	in <filename>/etc/systemd/system.conf</filename> (see
	81	<citerefentry><refentrytitle>systemd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
	82	for details). Alternatively, it is possible to enable
	83	resource accounting individually for services, by
	84	making use of the <varname>ControlGroup=</varname>
	85	option in the unit files (See
	86	<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
	87	for details).</para>
	88
	89	<para>To emphasize this: unless
	90	<literal>blkio</literal> and <literal>memory</literal>
	91	are enabled for the services in question with either
	92	of the options suggested above no resource accounting
	93	will be available for system services and the data shown
	94	by <command>systemd-cgtop</command> will be
	95	incomplete.</para>
	96	</refsect1>
	97
	98	<refsect1>
	99	<title>Options</title>
	100
	101	<para>The following options are understood:</para>
	102
	103	<variablelist>
	104	<varlistentry>
	105	<term><option>-h</option></term>
	106	<term><option>--help</option></term>
	107
	108	<listitem><para>Prints a short help
	109	text and exits.</para></listitem>
	110	</varlistentry>
	111
	112	<varlistentry>
	113	<term><option>--version</option></term>
	114
	115	<listitem><para>Prints a version string and
	116	exits.</para></listitem>
	117	</varlistentry>
	118
	119	<varlistentry>
	120	<term><option>-p</option></term>
	121
	122	<listitem><para>Order by control group
	123	path name.</para></listitem>
	124	</varlistentry>
	125
	126	<varlistentry>
	127	<term><option>-t</option></term>
	128
	129	<listitem><para>Order by number of
	130	tasks in control
	131	group (i.e. threads and processes).</para></listitem>
	132	</varlistentry>
	133
	134	<varlistentry>
	135	<term><option>-c</option></term>
	136
	137	<listitem><para>Order by CPU load.</para></listitem>
	138	</varlistentry>
	139
	140	<varlistentry>
	141	<term><option>-m</option></term>
	142
	143	<listitem><para>Order by memory usage.</para></listitem>
	144	</varlistentry>
	145
	146	<varlistentry>
	147	<term><option>-i</option></term>
	148
	149	<listitem><para>Order by disk I/O load.</para></listitem>
	150	</varlistentry>
	151
	152	<varlistentry>
	153	<term><option>-b</option></term>
	154	<term><option>--batch</option></term>
	155
	156	<listitem><para>Run in "batch" mode:
	157	do not accept input and run until the
	158	iteration limit set with
	159	<option>--iterations</option> is
	160	exhausted or until killed. This mode
	161	could be useful for sending output
	162	from <command>systemd-cgtop</command>
	163	to other programs or to a
	164	file.</para></listitem>
	165	</varlistentry>
	166
	167	<varlistentry>
	168	<term><option>-n</option></term>
	169	<term><option>--iterations=</option></term>
	170
	171	<listitem><para>Perform only this many
	172	iterations.</para></listitem>
	173	</varlistentry>
	174
	175	<varlistentry>
	176	<term><option>-d</option></term>
	177	<term><option>--delay=</option></term>
	178
	179	<listitem><para>Specify refresh delay
	180	in seconds (or if one of
	181	<literal>ms</literal>,
	182	<literal>us</literal>,
	183	<literal>min</literal> is specified as
	184	unit in this time
	185	unit).</para></listitem>
	186	</varlistentry>
	187
	188	<varlistentry>
	189	<term><option>--depth=</option></term>
	190
	191	<listitem><para>Maximum control group
	192	tree traversal depth. Specifies how
	193	deep <command>systemd-cgtop</command>
	194	shall traverse the control group
	195	hierarchies. If 0 is specified only
	196	the root group is monitored, for 1
	197	only the first level of control groups
	198	is monitored, and so on. Defaults to
	199	3.</para></listitem>
	200	</varlistentry>
	201
	202	</variablelist>
	203
	204	</refsect1>
	205
	206
	207	<refsect1>
	208	<title>Keys</title>
	209
	210	<para><command>systemd-cgtop</command> is an
	211	interactive tool and may be controlled via user input
	212	using the following keys:</para>
	213
	214	<variablelist>
	215	<varlistentry>
	216	<term>h</term>
	217
	218	<listitem><para>Shows a short help text.</para></listitem>
	219	</varlistentry>
	220
	221	<varlistentry>
	222	<term>SPACE</term>
	223
	224	<listitem><para>Immediately refresh output.</para></listitem>
	225	</varlistentry>
	226
	227	<varlistentry>
	228	<term>q</term>
	229
	230	<listitem><para>Terminate the program.</para></listitem>
	231	</varlistentry>
	232
	233
	234	<varlistentry>
	235	<term>p</term>
	236	<term>t</term>
	237	<term>c</term>
	238	<term>m</term>
	239	<term>i</term>
	240
	241	<listitem><para>Change ordering of control groups
	242	by path, number of tasks, CPU load,
	243	memory usage resp. IO
	244	load.</para></listitem>
	245	</varlistentry>
	246
	247	<varlistentry>
	248	<term>+</term>
	249	<term>-</term>
	250
	251	<listitem><para>Increase,
	252	resp. decrease refresh
	253	delay.</para></listitem>
	254	</varlistentry>
	255
	256	</variablelist>
	257	</refsect1>
	258
	259	<refsect1>
	260	<title>Exit status</title>
	261
	262	<para>On success 0 is returned, a non-zero failure
	263	code otherwise.</para>
	264	</refsect1>
	265
	266	<refsect1>
	267	<title>See Also</title>
	268	<para>
	269	<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
	270	<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
	271	<citerefentry><refentrytitle>systemd-cgls</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
	272	<citerefentry><refentrytitle>top</refentrytitle><manvolnum>1</manvolnum></citerefentry>
	273	</para>
	274	</refsect1>
	275
	276	</refentry>