<?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">&gt; 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>