X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=man%2Fsystemd-analyze.xml;h=ae45bfcf3150bf13d9cd9ddbd16173b4621187b3;hb=80f53eb59516f87e26e3afa405c61b4eed9ffe30;hp=c8d0b4743b743ba8d0fdefb0795039b2b07b5b50;hpb=e55933db18d1037876e7a0962bcf6ef6c0bbbd68;p=elogind.git

diff --git a/man/systemd-analyze.xml b/man/systemd-analyze.xml
index c8d0b4743..ae45bfcf3 100644
--- a/man/systemd-analyze.xml
+++ b/man/systemd-analyze.xml
@@ -34,6 +34,12 @@
                                 <surname>Poettering</surname>
                                 <email>lennart@poettering.net</email>
                         </author>
+                        <author>
+                                <contrib>Developer</contrib>
+                                <firstname>Harald</firstname>
+                                <surname>Hoyer</surname>
+                                <email>harald@redhat.com</email>
+                        </author>
                 </authorgroup>
         </refentryinfo>
 
@@ -54,6 +60,9 @@
                 <cmdsynopsis>
                         <command>systemd-analyze <arg choice="opt" rep="repeat">OPTIONS</arg> blame </command>
                 </cmdsynopsis>
+                <cmdsynopsis>
+                        <command>systemd-analyze <arg choice="opt" rep="repeat">OPTIONS</arg> critical-chain </command>
+                </cmdsynopsis>
                 <cmdsynopsis>
                         <command>systemd-analyze <arg choice="opt" rep="repeat">OPTIONS</arg> plot <arg choice="opt">&gt; file.svg</arg></command>
                 </cmdsynopsis>
@@ -88,25 +97,36 @@
                 be slow simply because it waits for the initialization
                 of another service to complete.</para>
 
+                <para><command>systemd-analyze critical-chain</command>
+                prints a tree of the time critical chain of units.
+                The time after the unit is active or started is printed
+                after the "@" character. The time the unit takes to
+                start is printed after the "+" character.
+                Note that the output might be misleading as the
+                initialization of one service might depend on socket
+                activation and because of the parallel execution
+                of units.</para>
+
                 <para><command>systemd-analyze plot</command> prints
                 an SVG graphic detailing which system services have
                 been started at what time, highlighting the time they
                 spent on initialization.</para>
 
-                <para><command>systemd-analyze dot</command>
-                Generate textual dependency graph description in dot
-                format for further processing with the GraphViz
+                <para><command>systemd-analyze dot</command> Generate
+                textual dependency graph description in dot format for
+                further processing with the GraphViz
                 <citerefentry><refentrytitle>dot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                 tool. Use a command line like <command>systemd-analyze
-                dot | dot -Tsvg > systemd.svg</command> to generate
-                a graphical dependency tree. Unless
+                dot | dot -Tsvg > systemd.svg</command> to generate a
+                graphical dependency tree. Unless
                 <option>--order</option> or <option>--require</option>
                 is passed the generated graph will show both ordering
-                and requirement dependencies.</para>
-
-                <para>Optional patterns may be given at the end. The
-                relationship is printed if any of these matches either
-                lefthand or righthand node.</para>
+                and requirement dependencies. Optional pattern
+                globbing style specifications
+                (e.g. <filename>*.target</filename>) may be given at
+                the end. A unit dependency is included in the graph if
+                any of these patterns match either the origin or
+                destination node.</para>
 
                 <para>If no command is passed <command>systemd-analyze
                 time</command> is implied.</para>
@@ -180,6 +200,19 @@
                                 unit name must match one of given
                                 values.</para></listitem>
                         </varlistentry>
+
+                        <varlistentry>
+                                <term><option>--fuzz=</option><replaceable>timespan</replaceable></term>
+
+                                <listitem><para>When used in conjunction
+                                with the <command>critical-chain</command>
+                                command (see above), also show units, which
+                                finished <replaceable>timespan</replaceable> earlier, than the
+                                latest unit in the same level. The unit of
+                                <replaceable>timespan</replaceable> is seconds
+                                unless specified with a different unit,
+                                i.e. "50ms".</para></listitem>
+                        </varlistentry>
                 </variablelist>
 
         </refsect1>
@@ -191,6 +224,23 @@
                 code otherwise.</para>
         </refsect1>
 
+        <refsect1>
+                <title>Examples</title>
+
+                <para>This plots all dependencies of any unit whose
+                name starts with "<literal>avahi-daemon.</literal>":</para>
+
+                <programlisting>$ systemd-analyze dot 'avahi-daemon.*' | dot -Tsvg > avahi.svg
+$ eog avahi.svg</programlisting>
+
+                <para>This plots the dependencies between all known target units:</para>
+
+                <programlisting>systemd-analyze dot --to-pattern='*.target' --from-patter='*.target' | dot -Tsvg > targets.svg
+$ eog targets.svg</programlisting>
+
+
+        </refsect1>
+
         <refsect1>
                 <title>See Also</title>
                 <para>