<?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"> <!-- 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-analyze"> <refentryinfo> <title>systemd-analyze</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-analyze</refentrytitle> <manvolnum>1</manvolnum> </refmeta> <refnamediv> <refname>systemd-analyze</refname> <refpurpose>Analyze system boot-up performance</refpurpose> </refnamediv> <refsynopsisdiv> <cmdsynopsis> <command>systemd-analyze <arg choice="opt" rep="repeat">OPTIONS</arg> time</command> </cmdsynopsis> <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> plot <arg choice="opt">> file.svg</arg></command> </cmdsynopsis> <cmdsynopsis> <command>systemd-analyze <arg choice="opt" rep="repeat">OPTIONS</arg> dot </command> </cmdsynopsis> </refsynopsisdiv> <refsect1> <title>Description</title> <para><command>systemd-analyze</command> may be used to determine system boot-up performance of the current boot.</para> <para><command>systemd-analyze time</command> prints the time spent in the kernel before userspace has been reached, the time spent in the initial RAM disk (initrd) before normal system userspace has been reached and the time normal system userspace took to initialize. Note that these measurements simply measure the time passed up to the point where all system services have been spawned, but not necessarily until they fully finished initialization or the disk is idle.</para> <para><command>systemd-analyze blame</command> prints a list of all running units, ordered by the time they took to initialize. This information may be used to optimize boot-up times. Note that the output might be misleading as the initialization of one service might be slow simply because it waits for the initialization of another service to complete.</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 <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 <option>--order</option> or <option>--require</option> is passed the generated graph will show both ordering and requirement dependencies.</para> <para>If no command is passed <command>systemd-analyze time</command> is implied.</para> </refsect1> <refsect1> <title>Options</title> <para>The following options are understood:</para> <variablelist> <varlistentry> <term><option>-h</option></term> <term><option>--help</option></term> <listitem><para>Prints a short help text and exits.</para></listitem> </varlistentry> <varlistentry> <term><option>--user</option></term> <listitem><para>Shows performance data of user sessions instead of the system manager.</para></listitem> </varlistentry> <varlistentry> <term><option>--order</option></term> <term><option>--require</option></term> <listitem><para>When used in conjunction with the <command>dot</command> command (see above), selects which dependencies are shown in the dependency graph. If <option>--order</option> is passed only dependencies of type <varname>After=</varname> or <varname>Before=</varname> are shown. If <option>--require</option> is passed only dependencies of type <varname>Requires=</varname>, <varname>RequiresOverridable=</varname>, <varname>Requisite=</varname>, <varname>RequisiteOverridable=</varname>, <varname>Wants=</varname> and <varname>Conflicts=</varname> are shown. If neither is passed, shows dependencies of all these types.</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> </para> </refsect1> </refentry>