man/systemd-analyze.xml

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  23
  24 <refentry id="systemd-analyze"
  25           xmlns:xi="http://www.w3.org/2001/XInclude">
  26
  27         <refentryinfo>
  28                 <title>systemd-analyze</title>
  29                 <productname>systemd</productname>
  30
  31                 <authorgroup>
  32                         <author>
  33                                 <contrib>Developer</contrib>
  34                                 <firstname>Lennart</firstname>
  35                                 <surname>Poettering</surname>
  36                                 <email>lennart@poettering.net</email>
  37                         </author>
  38                         <author>
  39                                 <contrib>Developer</contrib>
  40                                 <firstname>Harald</firstname>
  41                                 <surname>Hoyer</surname>
  42                                 <email>harald@redhat.com</email>
  43                         </author>
  44                 </authorgroup>
  45         </refentryinfo>
  46
  47         <refmeta>
  48                 <refentrytitle>systemd-analyze</refentrytitle>
  49                 <manvolnum>1</manvolnum>
  50         </refmeta>
  51
  52         <refnamediv>
  53                 <refname>systemd-analyze</refname>
  54                 <refpurpose>Analyze system boot-up performance</refpurpose>
  55         </refnamediv>
  56
  57         <refsynopsisdiv>
  58                 <cmdsynopsis>
  59                         <command>systemd-analyze</command>
  60                         <arg choice="opt" rep="repeat">OPTIONS</arg>
  61                         <arg>time</arg>
  62                 </cmdsynopsis>
  63                 <cmdsynopsis>
  64                         <command>systemd-analyze</command>
  65                         <arg choice="opt" rep="repeat">OPTIONS</arg>
  66                         <arg choice="plain">blame</arg>
  67                 </cmdsynopsis>
  68                 <cmdsynopsis>
  69                         <command>systemd-analyze</command>
  70                         <arg choice="opt" rep="repeat">OPTIONS</arg>
  71                         <arg choice="plain">critical-chain</arg>
  72                         <arg choice="opt" rep="repeat"><replaceable>UNIT</replaceable></arg>
  73                 </cmdsynopsis>
  74                 <cmdsynopsis>
  75                         <command>systemd-analyze</command>
  76                         <arg choice="opt" rep="repeat">OPTIONS</arg>
  77                         <arg choice="plain">plot</arg>
  78                         <arg choice="opt">&gt; file.svg</arg>
  79                 </cmdsynopsis>
  80                 <cmdsynopsis>
  81                         <command>systemd-analyze</command>
  82                         <arg choice="opt" rep="repeat">OPTIONS</arg>
  83                         <arg choice="plain">dot</arg>
  84                         <arg choice="opt" rep="repeat"><replaceable>PATTERN</replaceable></arg>
  85                         <arg choice="opt">&gt; file.dot</arg>
  86                 </cmdsynopsis>
  87                 <cmdsynopsis>
  88                         <command>systemd-analyze</command>
  89                         <arg choice="opt" rep="repeat">OPTIONS</arg>
  90                         <arg choice="plain">dump</arg>
  91                 </cmdsynopsis>
  92                 <cmdsynopsis>
  93                         <command>systemd-analyze</command>
  94                         <arg choice="opt" rep="repeat">OPTIONS</arg>
  95                         <arg choice="plain">set-log-level</arg>
  96                         <arg choice="opt"><replaceable>LEVEL</replaceable></arg>
  97                 </cmdsynopsis>
  98         </refsynopsisdiv>
  99
 100         <refsect1>
 101                 <title>Description</title>
 102
 103                 <para><command>systemd-analyze</command> may be used
 104                 to determine system boot-up performance statistics and
 105                 retrieve other state and tracing information from the
 106                 system and service manager.</para>
 107
 108                 <para><command>systemd-analyze time</command>
 109                 prints the time spent in the kernel before
 110                 userspace has been reached, the time spent in the
 111                 initial RAM disk (initrd) before normal system
 112                 userspace has been reached, and the time normal system
 113                 userspace took to initialize. Note that these
 114                 measurements simply measure the time passed up to the
 115                 point where all system services have been spawned, but
 116                 not necessarily until they fully finished
 117                 initialization or the disk is idle.</para>
 118
 119                 <para><command>systemd-analyze blame</command> prints
 120                 a list of all running units, ordered by the time they
 121                 took to initialize. This information may be used to
 122                 optimize boot-up times. Note that the output might be
 123                 misleading as the initialization of one service might
 124                 be slow simply because it waits for the initialization
 125                 of another service to complete.</para>
 126
 127                 <para><command>systemd-analyze critical-chain [<replaceable>UNIT...</replaceable>]</command>
 128                 prints a tree of the time-critical chain of units
 129                 (for each of the specified <replaceable>UNIT</replaceable>s
 130                 or for the default target otherwise).
 131                 The time after the unit is active or started is printed
 132                 after the "@" character. The time the unit takes to
 133                 start is printed after the "+" character.
 134                 Note that the output might be misleading as the
 135                 initialization of one service might depend on socket
 136                 activation and because of the parallel execution
 137                 of units.</para>
 138
 139                 <para><command>systemd-analyze plot</command> prints
 140                 an SVG graphic detailing which system services have
 141                 been started at what time, highlighting the time they
 142                 spent on initialization.</para>
 143
 144                 <para><command>systemd-analyze dot</command> generates
 145                 textual dependency graph description in dot format for
 146                 further processing with the GraphViz
 147                 <citerefentry><refentrytitle>dot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
 148                 tool. Use a command line like <command>systemd-analyze
 149                 dot | dot -Tsvg > systemd.svg</command> to generate a
 150                 graphical dependency tree. Unless
 151                 <option>--order</option> or <option>--require</option>
 152                 is passed, the generated graph will show both ordering
 153                 and requirement dependencies. Optional pattern
 154                 globbing style specifications
 155                 (e.g. <filename>*.target</filename>) may be given at
 156                 the end. A unit dependency is included in the graph if
 157                 any of these patterns match either the origin or
 158                 destination node.</para>
 159
 160                 <para><command>systemd-analyze dump</command> outputs
 161                 a (usually very long) human-readable serialization of
 162                 the complete server state. Its format is subject to
 163                 change without notice and should not be parsed by
 164                 applications.</para>
 165
 166                 <para><command>systemd-analyze set-log-level
 167                 <replaceable>LEVEL</replaceable></command> changes the
 168                 current log level of the <command>systemd</command>
 169                 daemon to <replaceable>LEVEL</replaceable> (accepts
 170                 the same values as <option>--log-level=</option>
 171                 described in
 172                 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>).</para>
 173
 174                 <para>If no command is passed, <command>systemd-analyze
 175                 time</command> is implied.</para>
 176
 177         </refsect1>
 178
 179         <refsect1>
 180                 <title>Options</title>
 181
 182                 <para>The following options are understood:</para>
 183
 184                 <variablelist>
 185                         <varlistentry>
 186                                 <term><option>-h</option></term>
 187                                 <term><option>--help</option></term>
 188
 189                                 <listitem><para>Prints a short help
 190                                 text and exits.</para></listitem>
 191                         </varlistentry>
 192
 193                         <varlistentry>
 194                                 <term><option>--user</option></term>
 195
 196                                 <listitem><para>Shows performance data
 197                                 of user sessions instead of the system
 198                                 manager.</para></listitem>
 199                         </varlistentry>
 200
 201                         <varlistentry>
 202                                 <term><option>--system</option></term>
 203
 204                                 <listitem><para>Shows performance data
 205                                 of the system manager. This is the
 206                                 implied default.</para></listitem>
 207                         </varlistentry>
 208
 209                         <varlistentry>
 210                                 <term><option>-H</option></term>
 211                                 <term><option>--host=</option></term>
 212
 213                                 <listitem><para>Execute the operation
 214                                 remotely. Specify a hostname, or
 215                                 username and hostname separated by
 216                                 <literal>@</literal>, to connect
 217                                 to. This will use SSH to talk to the
 218                                 remote machine manager
 219                                 instance.</para></listitem>
 220                         </varlistentry>
 221
 222                         <varlistentry>
 223                                 <term><option>-M</option></term>
 224                                 <term><option>--machine=</option></term>
 225
 226                                 <listitem><para>Execute the operation on a
 227                                 local container. Specify a container
 228                                 name to connect to.</para></listitem>
 229                         </varlistentry>
 230
 231                         <varlistentry>
 232                                 <term><option>--order</option></term>
 233                                 <term><option>--require</option></term>
 234
 235                                 <listitem><para>When used in
 236                                 conjunction with the
 237                                 <command>dot</command> command (see
 238                                 above), selects which dependencies are
 239                                 shown in the dependency graph. If
 240                                 <option>--order</option> is passed,
 241                                 only dependencies of type
 242                                 <varname>After=</varname> or
 243                                 <varname>Before=</varname> are
 244                                 shown. If <option>--require</option>
 245                                 is passed, only dependencies of type
 246                                 <varname>Requires=</varname>,
 247                                 <varname>RequiresOverridable=</varname>,
 248                                 <varname>Requisite=</varname>,
 249                                 <varname>RequisiteOverridable=</varname>,
 250                                 <varname>Wants=</varname> and
 251                                 <varname>Conflicts=</varname> are
 252                                 shown. If neither is passed, this shows
 253                                 dependencies of all these
 254                                 types.</para></listitem>
 255                         </varlistentry>
 256
 257                         <varlistentry>
 258                                 <term><option>--from-pattern=</option></term>
 259                                 <term><option>--to-pattern=</option></term>
 260
 261                                 <listitem><para>When used in
 262                                 conjunction with the
 263                                 <command>dot</command> command (see
 264                                 above), this selects which relationships
 265                                 are shown in the dependency graph.
 266                                 They both require
 267                                 <citerefentry><refentrytitle>glob</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 268                                 patterns as arguments, which are
 269                                 matched against left-hand and
 270                                 right-hand, respectively, nodes of a
 271                                 relationship. Each of these can be
 272                                 used more than once, which means a
 273                                 unit name must match one of the given
 274                                 values.</para></listitem>
 275                         </varlistentry>
 276
 277                         <varlistentry>
 278                                 <term><option>--fuzz=</option><replaceable>timespan</replaceable></term>
 279
 280                                 <listitem><para>When used in conjunction
 281                                 with the <command>critical-chain</command>
 282                                 command (see above), also show units, which
 283                                 finished <replaceable>timespan</replaceable> earlier, than the
 284                                 latest unit in the same level. The unit of
 285                                 <replaceable>timespan</replaceable> is seconds
 286                                 unless specified with a different unit,
 287                                 e.g. "50ms".</para></listitem>
 288                         </varlistentry>
 289
 290                         <varlistentry>
 291                                 <term><option>--no-pager</option></term>
 292
 293                                 <listitem>
 294                                         <para>Do not pipe output into a pager.</para>
 295                                 </listitem>
 296                         </varlistentry>
 297                 </variablelist>
 298
 299         </refsect1>
 300
 301         <refsect1>
 302                 <title>Exit status</title>
 303
 304                 <para>On success, 0 is returned, a non-zero failure
 305                 code otherwise.</para>
 306         </refsect1>
 307
 308         <refsect1>
 309                 <title>Examples</title>
 310
 311                 <para>This plots all dependencies of any unit whose
 312                 name starts with <literal>avahi-daemon.</literal>:</para>
 313
 314                 <programlisting>$ systemd-analyze dot 'avahi-daemon.*' | dot -Tsvg > avahi.svg
 315 $ eog avahi.svg</programlisting>
 316
 317                 <para>This plots the dependencies between all known target units:</para>
 318
 319                 <programlisting>systemd-analyze dot --to-pattern='*.target' --from-pattern='*.target' | dot -Tsvg > targets.svg
 320 $ eog targets.svg</programlisting>
 321
 322
 323         </refsect1>
 324
 325         <xi:include href="less-variables.xml" />
 326
 327         <refsect1>
 328                 <title>See Also</title>
 329                 <para>
 330                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 331                         <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
 332                 </para>
 333         </refsect1>
 334
 335 </refentry>