1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
|
<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
<!ENTITY % entities SYSTEM "custom-entities.ent" >
%entities;
]>
<!--
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>.
If <command>systemd-cgtop</command> is not connected to a tty,
only one iteration is performed and no columns headers are
printed. 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>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>
<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>-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>-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>
<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>
|
