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diff --git a/src/systemd-cgtop/systemd-cgtop.xml b/src/systemd-cgtop/systemd-cgtop.xml new file mode 100644 index 0000000000..c76f646984 --- /dev/null +++ b/src/systemd-cgtop/systemd-cgtop.xml @@ -0,0 +1,373 @@ +<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*--> +<!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 + WITHOUT ANY WARRANTY; without even the implied warranty of + 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" + 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 tasks/processes in the 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 I/O 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>-P</option></term> + + <listitem><para>Count only userspace processes instead of all + tasks. By default, all tasks are counted: each kernel thread + and each userspace thread individually. With this setting, + kernel threads are excluded from the counting and each + userspace process only counts as one, regardless how many + threads it consists of. This setting may also be toggled at + runtime by pressing the <keycap>P</keycap> key. This option + may not be combined with + <option>-k</option>.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>-k</option></term> + + <listitem><para>Count only userspace processes and kernel + threads instead of all tasks. By default, all tasks are + counted: each kernel thread and each userspace thread + individually. With this setting, kernel threads are included in + the counting and each userspace process only counts as on one, + regardless how many threads it consists of. This setting may + also be toggled at runtime by pressing the <keycap>k</keycap> + key. This option may not be combined with + <option>-P</option>.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--recursive=</option></term> + + <listitem><para>Controls whether the number of processes shown + for a control group shall include all processes that are + contained in any of the child control groups as well. Takes a + boolean argument, which defaults to <literal>yes</literal>. If + enabled, the processes in child control groups are included, if + disabled, only the processes in the control group itself are + counted. This setting may also be toggled at runtime by + pressing the <keycap>r</keycap> key. Note that this setting + only applies to process counting, i.e. when the + <option>-P</option> or <option>-k</option> options are + used. It has not effect if all tasks are counted, in which + case the counting is always recursive.</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> + + <varlistentry> + <term><option>-M <replaceable>MACHINE</replaceable></option></term> + <term><option>--machine=<replaceable>MACHINE</replaceable></option></term> + + <listitem><para>Limit control groups shown to the part + corresponding to the container + <replaceable>MACHINE</replaceable>.</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 I/O 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>P</keycap></term> + + <listitem><para>Toggle between counting all tasks, or only + userspace processes. This setting may also be controlled using + the <option>-P</option> command line switch (see + above).</para></listitem> + </varlistentry> + + <varlistentry> + <term><keycap>k</keycap></term> + + <listitem><para>Toggle between counting all tasks, or only + userspace processes and kernel threads. This setting may also + be controlled using the <option>-k</option> command line + switch (see above).</para></listitem> + </varlistentry> + + <varlistentry> + <term><keycap>r</keycap></term> + + <listitem><para>Toggle between recursively including or + excluding processes in child control groups in control group + process counts. This setting may also be controlled using the + <option>--recursive=</option> command line switch. This key is + not available if all tasks are counted, it is only available + if processes are counted, as enabled with the + <keycap>P</keycap> or <keycap>k</keycap> + keys.</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> |