summaryrefslogtreecommitdiff
path: root/man/systemd-cgtop.xml
blob: 859c1a286557bfb31c9c362ae392dfa6bae64f20 (plain)
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
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
<?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 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. 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, 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>

      <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 IO 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 of 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>