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authorLennart Poettering <lennart@poettering.net>2012-06-27 01:53:07 +0200
committerLennart Poettering <lennart@poettering.net>2012-06-27 01:53:07 +0200
commit359deb60c25147e91a69c227ace686654ea7f484 (patch)
tree198c9753214d293f7c3104e59092fb9937061538 /man
parent7df46b2af58d171665fe99073188f91d567f2696 (diff)
man: write man page for systemd-analyze
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+<?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>
+ </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>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>
+ </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>