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351 lines
16 KiB
XML
351 lines
16 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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<author>
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<contrib>Developer</contrib>
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<firstname>Harald</firstname>
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<surname>Hoyer</surname>
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<email>harald@redhat.com</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</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg>time</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">blame</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">critical-chain</arg>
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<arg choice="opt" rep="repeat"><replaceable>UNIT</replaceable></arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">plot</arg>
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<arg choice="opt">> file.svg</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">dot</arg>
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<arg choice="opt" rep="repeat"><replaceable>PATTERN</replaceable></arg>
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<arg choice="opt">> file.dot</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">dump</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-analyze</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">set-log-level</arg>
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<arg choice="opt"><replaceable>LEVEL</replaceable></arg>
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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 statistics and
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retrieve other state and tracing information from the
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system and service manager.</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 critical-chain [<replaceable>UNIT...</replaceable>]</command>
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prints a tree of the time-critical chain of units
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(for each of the specified <replaceable>UNIT</replaceable>s
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or for the default target otherwise).
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The time after the unit is active or started is printed
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after the "@" character. The time the unit takes to
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start is printed after the "+" character.
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Note that the output might be misleading as the
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initialization of one service might depend on socket
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activation and because of the parallel execution
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of units.</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><command>systemd-analyze dot</command> generates
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textual dependency graph description in dot format for
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further processing with the GraphViz
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<citerefentry><refentrytitle>dot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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tool. Use a command line like <command>systemd-analyze
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dot | dot -Tsvg > systemd.svg</command> to generate a
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graphical dependency tree. Unless
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<option>--order</option> or <option>--require</option>
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is passed, the generated graph will show both ordering
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and requirement dependencies. Optional pattern
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globbing style specifications
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(e.g. <filename>*.target</filename>) may be given at
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the end. A unit dependency is included in the graph if
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any of these patterns match either the origin or
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destination node.</para>
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<para><command>systemd-analyze dump</command> outputs
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a (usually very long) human-readable serialization of
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the complete server state. Its format is subject to
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change without notice and should not be parsed by
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applications.</para>
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<para><command>systemd-analyze set-log-level
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<replaceable>LEVEL</replaceable></command> changes the
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current log level of the <command>systemd</command>
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daemon to <replaceable>LEVEL</replaceable> (accepts
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the same values as <option>--log-level=</option>
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described in
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>).</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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<varlistentry>
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<term><option>--system</option></term>
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<listitem><para>Shows performance data
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of the system manager. This is the
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implied default.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-H</option></term>
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<term><option>--host=</option></term>
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<listitem><para>Execute the operation
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remotely. Specify a hostname, or
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username and hostname separated by
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<literal>@</literal>, to connect
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to. This will use SSH to talk to the
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remote machine manager
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instance.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-M</option></term>
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<term><option>--machine=</option></term>
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<listitem><para>Execute the operation on a
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local container. Specify a container
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name to connect to.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--order</option></term>
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<term><option>--require</option></term>
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<listitem><para>When used in
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conjunction with the
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<command>dot</command> command (see
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above), selects which dependencies are
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shown in the dependency graph. If
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<option>--order</option> is passed,
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only dependencies of type
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<varname>After=</varname> or
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<varname>Before=</varname> are
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shown. If <option>--require</option>
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is passed, only dependencies of type
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<varname>Requires=</varname>,
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<varname>RequiresOverridable=</varname>,
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<varname>Requisite=</varname>,
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<varname>RequisiteOverridable=</varname>,
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<varname>Wants=</varname> and
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<varname>Conflicts=</varname> are
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shown. If neither is passed, this shows
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dependencies of all these
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types.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--from-pattern=</option></term>
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<term><option>--to-pattern=</option></term>
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<listitem><para>When used in
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conjunction with the
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<command>dot</command> command (see
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above), this selects which relationships
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are shown in the dependency graph.
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They both require
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<citerefentry><refentrytitle>glob</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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patterns as arguments, which are
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matched against left-hand and
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right-hand, respectively, nodes of a
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relationship. Each of these can be
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used more than once, which means a
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unit name must match one of the given
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values.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--fuzz=</option><replaceable>timespan</replaceable></term>
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<listitem><para>When used in conjunction
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with the <command>critical-chain</command>
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command (see above), also show units, which
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finished <replaceable>timespan</replaceable> earlier, than the
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latest unit in the same level. The unit of
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<replaceable>timespan</replaceable> is seconds
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unless specified with a different unit,
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e.g. "50ms".</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-pager</option></term>
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<listitem>
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<para>Do not pipe output into a pager.</para>
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</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>Examples</title>
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<para>This plots all dependencies of any unit whose
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name starts with <literal>avahi-daemon.</literal>:</para>
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<programlisting>$ systemd-analyze dot 'avahi-daemon.*' | dot -Tsvg > avahi.svg
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$ eog avahi.svg</programlisting>
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<para>This plots the dependencies between all known target units:</para>
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<programlisting>systemd-analyze dot --to-pattern='*.target' --from-pattern='*.target' | dot -Tsvg > targets.svg
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$ eog targets.svg</programlisting>
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</refsect1>
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<refsect1>
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<title>Environment</title>
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<variablelist class='environment-variables'>
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<varlistentry>
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<term><varname>$SYSTEMD_PAGER</varname></term>
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<listitem>
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<para>Pager to use when <option>--no-pager</option> is not
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given; overrides <varname>$PAGER</varname>. Setting this to
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an empty string or the value <literal>cat</literal> is
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equivalent to passing
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<option>--no-pager</option>.</para>
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</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>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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