Systemd/man/systemd-bootchart.xml

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  This file is part of systemd.

  Copyright 2012 Intel Corporation

  Authors:
    Auke Kok <auke-jan.h.kok@intel.com>
    William Giokas <1007380@gmail.com>

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<refentry id="systemd-bootchart" conditional='ENABLE_BOOTCHART'>
        <refentryinfo>
                <title>systemd-bootchart</title>
                <productname>systemd</productname>

                <authorgroup>
                        <author>
                                <contrib>Developer</contrib>
                                <firstname>Auke</firstname>
                                <surname>Kok</surname>
                                <email>auke-jan.h.kok@intel.com</email>
                        </author>
                </authorgroup>
        </refentryinfo>

        <refmeta>
                <refentrytitle>systemd-bootchart</refentrytitle>
                <manvolnum>1</manvolnum>
        </refmeta>

        <refnamediv>
                <refname>systemd-bootchart</refname>
                <refpurpose>Boot performance analysis graphing tool</refpurpose>
        </refnamediv>

        <refsect1>
                <title>Description</title>

                <para>Systemd-bootchart is an boot time analysis tool. It represents
                various aspects of the system as graph elements. These graph
                elements allow the user to determine resource usage, efficiency
                and performance issues.</para>

        </refsect1>

        <refsect1>
                <title>Invocation</title>

                <para>systemd-bootchart can be invoked in several different ways:</para>

                <variablelist>

                        <varlistentry>
                                <title>Kernel invocation</title>
                                <listitem><para>The kernel can invoke systemd-bootchart
                                instead of the init process. In itself, systemd-bootchart
                                will invoke <filename>/sbin/init</filename> if invoked in
                                this matter.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <title>Started as a standalone program</title>
                                <listitem><para>One can execute systemd-bootchart as
                                normal application from the commandline. In this mode
                                it is highly recommended to pass the "-r" flag in order
                                to not graph the time elapsed since boot and before
                                systemd-bootchart was started, as it may result in
                                extremely large graphs.
                                </para></listitem>
                        </varlistentry>
                </variablelist>
        </refsect1>

        <refsect1>
                <title>Options</title>

                <variablelist class='bootchart-directives'>

                        <varlistentry>
                                <term><option>-n</option></term>
                                <term><option>--sample N</option></term>
                                <listitem><para>Specify the amount of samples to
                                record total before bootchart exits. Each sample will
                                record at intervals defined by --freq.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-f</option></term>
                                <term><option>--freq N</option></term>
                                <listitem><para>Specify the sample log frequency.
                                This can be a fractional number, but must be larger than
                                0.0. Most systems can cope with values under 25-50 without
                                impacting boot time severely.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-r</option></term>
                                <term><option>--rel</option></term>
                                <listitem><para>Use relative times instead of absolute
                                times. This is useful for using bootchart at post-boot
                                time to profile an already booted system, otherwise the
                                graph would become extremely large. If set, the
                                horizontal axis starts at the first recorded sample
                                instead of time=0.0.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-F</option></term>
                                <term><option>--filter</option></term>
                                <listitem><para>Disable filtering of tasks tasks that
                                did not contribute significantly to the boot. Processes
                                that are too short-lived (only seen in one sample) or
                                that do not consume any significant CPU time (less than
                                0.001sec) will not be displayed in the output graph.
                                </para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-o</option></term>
                                <term><option>--output [path]</option></term>
                                <listitem><para>Configures the output folder for writing
                                the graphs. By default, bootchart writes the graphs to
                                <filename>/run/log</filename>.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-i</option></term>
                                <term><option>--init [path]</option></term>
                                <listitem><para>Set init binary to run. Defaults to
                                <filename>/sbin/init</filename>.
                                </para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-p</option></term>
                                <term><option>--pss</option></term>
                                <listitem><para>Enable logging and graphing
                                of processes PSS memory consumption.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-e</option></term>
                                <term><option>--entropy</option></term>
                                <listitem><para>Enable logging and graphing
                                of the kernel random entropy pool size.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-x</option></term>
                                <term><option>--scale-x N</option></term>
                                <listitem><para>Horizontal scaling factor for all variable
                                graph components.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>-y</option></term>
                                <term><option>--scale-y N</option></term>
                                <listitem><para>Vertical scaling factor for all variable
                                graph components.</para></listitem>
                        </varlistentry>

                </variablelist>


        </refsect1>

        <refsect1>
                <title>Output</title>

                <para>Systemd-bootchart generates SVG graphs. In order to render these
                on a graphical display any SVG capable viewer can be used. It should be
                noted that the SVG render engines in most browsers (including Chrome
                and Firefox) are many times faster than dedicated graphical applications
                like Gimp and Inkscape.  Just point your browser at "file:///var/log"!
                </para>
        </refsect1>

        <refsect1>
                  <title>See Also</title>
                  <para>
                          <citerefentry><refentrytitle>bootchart.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
                  </para>
        </refsect1>

</refentry>