man/systemd-analyze.xml

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   8   Copyright 2012 Lennart Poettering
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  23
  24 <refentry id="systemd-analyze">
  25
  26         <refentryinfo>
  27                 <title>systemd-analyze</title>
  28                 <productname>systemd</productname>
  29
  30                 <authorgroup>
  31                         <author>
  32                                 <contrib>Developer</contrib>
  33                                 <firstname>Lennart</firstname>
  34                                 <surname>Poettering</surname>
  35                                 <email>lennart@poettering.net</email>
  36                         </author>
  37                         <author>
  38                                 <contrib>Developer</contrib>
  39                                 <firstname>Harald</firstname>
  40                                 <surname>Hoyer</surname>
  41                                 <email>harald@redhat.com</email>
  42                         </author>
  43                 </authorgroup>
  44         </refentryinfo>
  45
  46         <refmeta>
  47                 <refentrytitle>systemd-analyze</refentrytitle>
  48                 <manvolnum>1</manvolnum>
  49         </refmeta>
  50
  51         <refnamediv>
  52                 <refname>systemd-analyze</refname>
  53                 <refpurpose>Analyze system boot-up performance</refpurpose>
  54         </refnamediv>
  55
  56         <refsynopsisdiv>
  57                 <cmdsynopsis>
  58                         <command>systemd-analyze</command>
  59                         <arg choice="opt" rep="repeat">OPTIONS</arg>
  60                         <arg>time</arg>
  61                 </cmdsynopsis>
  62                 <cmdsynopsis>
  63                         <command>systemd-analyze</command>
  64                         <arg choice="opt" rep="repeat">OPTIONS</arg>
  65                         <arg choice="plain">blame</arg>
  66                 </cmdsynopsis>
  67                 <cmdsynopsis>
  68                         <command>systemd-analyze</command>
  69                         <arg choice="opt" rep="repeat">OPTIONS</arg>
  70                         <arg choice="plain">critical-chain</arg>
  71                         <arg choice="opt" rep="repeat"><replaceable>UNIT</replaceable></arg>
  72                 </cmdsynopsis>
  73                 <cmdsynopsis>
  74                         <command>systemd-analyze</command>
  75                         <arg choice="opt" rep="repeat">OPTIONS</arg>
  76                         <arg choice="plain">plot</arg>
  77                         <arg choice="opt">&gt; file.svg</arg>
  78                 </cmdsynopsis>
  79                 <cmdsynopsis>
  80                         <command>systemd-analyze</command>
  81                         <arg choice="opt" rep="repeat">OPTIONS</arg>
  82                         <arg choice="plain">dot</arg>
  83                         <arg choice="opt" rep="repeat"><replaceable>PATTERN</replaceable></arg>
  84                         <arg choice="opt">&gt; file.dot</arg>
  85                 </cmdsynopsis>
  86                 <cmdsynopsis>
  87                         <command>systemd-analyze</command>
  88                         <arg choice="opt" rep="repeat">OPTIONS</arg>
  89                         <arg choice="plain">dump</arg>
  90                 </cmdsynopsis>
  91                 <cmdsynopsis>
  92                         <command>systemd-analyze</command>
  93                         <arg choice="opt" rep="repeat">OPTIONS</arg>
  94                         <arg choice="plain">set-log-level</arg>
  95                         <arg choice="opt"><replaceable>LEVEL</replaceable></arg>
  96                 </cmdsynopsis>
  97         </refsynopsisdiv>
  98
  99         <refsect1>
 100                 <title>Description</title>
 101
 102                 <para><command>systemd-analyze</command> may be used
 103                 to determine system boot-up performance statistics and
 104                 retrieve other state and tracing information from the
 105                 system and service manager.</para>
 106
 107                 <para><command>systemd-analyze time</command>
 108                 prints the time spent in the kernel before
 109                 userspace has been reached, the time spent in the
 110                 initial RAM disk (initrd) before normal system
 111                 userspace has been reached, and the time normal system
 112                 userspace took to initialize. Note that these
 113                 measurements simply measure the time passed up to the
 114                 point where all system services have been spawned, but
 115                 not necessarily until they fully finished
 116                 initialization or the disk is idle.</para>
 117
 118                 <para><command>systemd-analyze blame</command> prints
 119                 a list of all running units, ordered by the time they
 120                 took to initialize. This information may be used to
 121                 optimize boot-up times. Note that the output might be
 122                 misleading as the initialization of one service might
 123                 be slow simply because it waits for the initialization
 124                 of another service to complete.</para>
 125
 126                 <para><command>systemd-analyze critical-chain [<replaceable>UNIT...</replaceable>]</command>
 127                 prints a tree of the time-critical chain of units
 128                 (for each of the specified <replaceable>UNIT</replaceable>s
 129                 or for the default target otherwise).
 130                 The time after the unit is active or started is printed
 131                 after the "@" character. The time the unit takes to
 132                 start is printed after the "+" character.
 133                 Note that the output might be misleading as the
 134                 initialization of one service might depend on socket
 135                 activation and because of the parallel execution
 136                 of units.</para>
 137
 138                 <para><command>systemd-analyze plot</command> prints
 139                 an SVG graphic detailing which system services have
 140                 been started at what time, highlighting the time they
 141                 spent on initialization.</para>
 142
 143                 <para><command>systemd-analyze dot</command> generates
 144                 textual dependency graph description in dot format for
 145                 further processing with the GraphViz
 146                 <citerefentry><refentrytitle>dot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
 147                 tool. Use a command line like <command>systemd-analyze
 148                 dot | dot -Tsvg > systemd.svg</command> to generate a
 149                 graphical dependency tree. Unless
 150                 <option>--order</option> or <option>--require</option>
 151                 is passed, the generated graph will show both ordering
 152                 and requirement dependencies. Optional pattern
 153                 globbing style specifications
 154                 (e.g. <filename>*.target</filename>) may be given at
 155                 the end. A unit dependency is included in the graph if
 156                 any of these patterns match either the origin or
 157                 destination node.</para>
 158
 159                 <para><command>systemd-analyze dump</command> outputs
 160                 a (usually very long) human-readable serialization of
 161                 the complete server state. Its format is subject to
 162                 change without notice and should not be parsed by
 163                 applications.</para>
 164
 165                 <para><command>systemd-analyze set-log-level
 166                 <replaceable>LEVEL</replaceable></command> changes the
 167                 current log level of the <command>systemd</command>
 168                 daemon to <replaceable>LEVEL</replaceable> (accepts
 169                 the same values as <option>--log-level=</option>
 170                 described in
 171                 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>).</para>
 172
 173                 <para>If no command is passed, <command>systemd-analyze
 174                 time</command> is implied.</para>
 175
 176         </refsect1>
 177
 178         <refsect1>
 179                 <title>Options</title>
 180
 181                 <para>The following options are understood:</para>
 182
 183                 <variablelist>
 184                         <varlistentry>
 185                                 <term><option>-h</option></term>
 186                                 <term><option>--help</option></term>
 187
 188                                 <listitem><para>Prints a short help
 189                                 text and exits.</para></listitem>
 190                         </varlistentry>
 191
 192                         <varlistentry>
 193                                 <term><option>--user</option></term>
 194
 195                                 <listitem><para>Shows performance data
 196                                 of user sessions instead of the system
 197                                 manager.</para></listitem>
 198                         </varlistentry>
 199
 200                         <varlistentry>
 201                                 <term><option>--order</option></term>
 202                                 <term><option>--require</option></term>
 203
 204                                 <listitem><para>When used in
 205                                 conjunction with the
 206                                 <command>dot</command> command (see
 207                                 above), selects which dependencies are
 208                                 shown in the dependency graph. If
 209                                 <option>--order</option> is passed,
 210                                 only dependencies of type
 211                                 <varname>After=</varname> or
 212                                 <varname>Before=</varname> are
 213                                 shown. If <option>--require</option>
 214                                 is passed, only dependencies of type
 215                                 <varname>Requires=</varname>,
 216                                 <varname>RequiresOverridable=</varname>,
 217                                 <varname>Requisite=</varname>,
 218                                 <varname>RequisiteOverridable=</varname>,
 219                                 <varname>Wants=</varname> and
 220                                 <varname>Conflicts=</varname> are
 221                                 shown. If neither is passed, this shows
 222                                 dependencies of all these
 223                                 types.</para></listitem>
 224                         </varlistentry>
 225
 226                         <varlistentry>
 227                                 <term><option>--from-pattern=</option></term>
 228                                 <term><option>--to-pattern=</option></term>
 229
 230                                 <listitem><para>When used in
 231                                 conjunction with the
 232                                 <command>dot</command> command (see
 233                                 above), this selects which relationships
 234                                 are shown in the dependency graph.
 235                                 They both require
 236                                 <citerefentry><refentrytitle>glob</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 237                                 patterns as arguments, which are
 238                                 matched against left-hand and
 239                                 right-hand, respectively, nodes of a
 240                                 relationship. Each of these can be
 241                                 used more than once, which means a
 242                                 unit name must match one of the given
 243                                 values.</para></listitem>
 244                         </varlistentry>
 245
 246                         <varlistentry>
 247                                 <term><option>--fuzz=</option><replaceable>timespan</replaceable></term>
 248
 249                                 <listitem><para>When used in conjunction
 250                                 with the <command>critical-chain</command>
 251                                 command (see above), also show units, which
 252                                 finished <replaceable>timespan</replaceable> earlier, than the
 253                                 latest unit in the same level. The unit of
 254                                 <replaceable>timespan</replaceable> is seconds
 255                                 unless specified with a different unit,
 256                                 e.g. "50ms".</para></listitem>
 257                         </varlistentry>
 258
 259                         <varlistentry>
 260                                 <term><option>--no-pager</option></term>
 261
 262                                 <listitem>
 263                                         <para>Do not pipe output into a pager.</para>
 264                                 </listitem>
 265                         </varlistentry>
 266                 </variablelist>
 267
 268         </refsect1>
 269
 270         <refsect1>
 271                 <title>Exit status</title>
 272
 273                 <para>On success 0 is returned, a non-zero failure
 274                 code otherwise.</para>
 275         </refsect1>
 276
 277         <refsect1>
 278                 <title>Examples</title>
 279
 280                 <para>This plots all dependencies of any unit whose
 281                 name starts with <literal>avahi-daemon.</literal>:</para>
 282
 283                 <programlisting>$ systemd-analyze dot 'avahi-daemon.*' | dot -Tsvg > avahi.svg
 284 $ eog avahi.svg</programlisting>
 285
 286                 <para>This plots the dependencies between all known target units:</para>
 287
 288                 <programlisting>systemd-analyze dot --to-pattern='*.target' --from-pattern='*.target' | dot -Tsvg > targets.svg
 289 $ eog targets.svg</programlisting>
 290
 291
 292         </refsect1>
 293
 294         <refsect1>
 295                 <title>Environment</title>
 296
 297                 <variablelist class='environment-variables'>
 298                         <varlistentry>
 299                                 <term><varname>$SYSTEMD_PAGER</varname></term>
 300
 301                                 <listitem>
 302                                         <para>Pager to use when <option>--no-pager</option> is not
 303                                         given; overrides <varname>$PAGER</varname>.  Setting this to
 304                                         an empty string or the value <literal>cat</literal> is
 305                                         equivalent to passing
 306                                         <option>--no-pager</option>.</para>
 307                                 </listitem>
 308                         </varlistentry>
 309                 </variablelist>
 310         </refsect1>
 311
 312         <refsect1>
 313                 <title>See Also</title>
 314                 <para>
 315                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 316                         <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
 317                 </para>
 318         </refsect1>
 319
 320 </refentry>