45d7a8bb6c
In preparation of the unified cgroup support, let's clean up cgtop: a) rework time code to be based on "nsec_t" rather than "struct timespec" b) Introduce long option --order= for selecting ordering c) count number of processes only in the main hierarchy, don't bother with the controller hierarchies. We don't allow orthogonal hierarchies in systemd anymore, hence there's no point to check the other hierarchies. d) Deal with non-monotonic cpuacct values (see #749) e) When sorting groups, don't do prefix compare when ordering by number of tasks, since this is not accumulative for all children. f) Actually make --cpu without parameter work g) Don't output control characters when we get them as input. Fixes #749.
283 lines
9.3 KiB
XML
283 lines
9.3 KiB
XML
<?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 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.</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).</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>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>Sort the control groups by path, number of
|
|
tasks, CPU load, memory usage, or IO load, respectively.
|
|
</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>%</term>
|
|
|
|
<listitem><para>Toggle between showing CPU time as time or
|
|
percentage.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term>+</term>
|
|
<term>-</term>
|
|
|
|
<listitem><para>Increase or decrease refresh delay,
|
|
respectively.</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>
|