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139 lines
5.5 KiB
XML
139 lines
5.5 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-analyze">
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<refentryinfo>
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<title>systemd-analyze</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-analyze</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-analyze</refname>
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<refpurpose>Analyze system boot-up performance</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-analyze <arg choice="opt" rep="repeat">OPTIONS</arg> time</command>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze <arg choice="opt" rep="repeat">OPTIONS</arg> blame </command>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze <arg choice="opt" rep="repeat">OPTIONS</arg> plot <arg choice="opt">> file.svg</arg></command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd-analyze</command> may be used
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to determine system boot-up performance of the current
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boot.</para>
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<para><command>systemd-analyze time</command>
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prints the time spent in the kernel before
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userspace has been reached, the time spent in the
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initial RAM disk (initrd) before normal system
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userspace has been reached and the time normal system
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userspace took to initialize. Note that these
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measurements simply measure the time passed up to the
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point where all system services have been spawned, but
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not necessarily until they fully finished
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initialization or the disk is idle.</para>
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<para><command>systemd-analyze blame</command> prints
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a list of all running units, ordered by the time they
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took to initialize. This information may be used to
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optimize boot-up times. Note that the output might be
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misleading as the initialization of one service might
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be slow simply because it waits for the initialization
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of another service to complete.</para>
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<para><command>systemd-analyze plot</command> prints
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an SVG graphic detailing which system services have
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been started at what time, highlighting the time they
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spent on initialization.</para>
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<para>If no command is passed <command>systemd-analyze
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time</command> is implied.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>-h</option></term>
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<term><option>--help</option></term>
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<listitem><para>Prints a short help
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text and exits.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--user</option></term>
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<listitem><para>Shows performance data
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of user sessions instead of the system
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manager.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success 0 is returned, a non-zero failure
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code otherwise.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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