systemd/man/bootchart.conf.xml

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    Auke Kok <auke-jan.h.kok@intel.com>

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<refentry id="bootchart.conf">
        <refentryinfo>
                <title>bootchart.conf</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>bootchart.conf</refentrytitle>
                <manvolnum>5</manvolnum>
        </refmeta>

        <refnamediv>
                <refname>bootchart.conf</refname>
                <refpurpose>Boot performance analysis graphing tool configuration file</refpurpose>
        </refnamediv>

        <refsynopsisdiv>
                <para><filename>/etc/systemd/bootchart.conf</filename></para>
        </refsynopsisdiv>

        <refsect1>
                <title>Description</title>

                <para>When starting, systemd-bootchart will read the
                configuration file <filename>bootchart.conf</filename>.
                This configuration file determines logging parameters and
                graph output.</para>

        </refsect1>

        <refsect1>
                <title>Options</title>

                <variablelist class='bootchart-directives'>

                        <varlistentry>
                                <term><varname>samples=500</varname></term>
                                <listitem><para>Configure the amount of samples to
                                record total before bootchart exits. Each sample will
                                record at intervals defined by freq=.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>freq=25</varname></term>
                                <listitem><para>Configure 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><varname>rel=0</varname></term>
                                <listitem><para>Configures whether the left axis of the
                                output graph equals time=0.0 (CLOCK_MONOTONIC start). 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 to a non-zero value, the horizontal
                                axis starts at the first recorded sample instead of time=0.0.
                                </para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>filter=0</varname></term>
                                <listitem><para>Configures whether the resulting graph
                                should omit 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><varname>output=[path]</varname></term>
                                <listitem><para>Configures the output folder for writing
                                the graphs. By default, bootchart writes the graphs to
                                <filename>/var/log</filename>.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>init=[path]</varname></term>
                                <listitem><para>Configures bootchart to run a non-standard
                                binary instead of <filename>/sbin/init</filename>. This
                                option is only relevant if bootchart was invoked from the
                                kernel command line with
                                init=/usr/lib/systemd/systemd-bootchart.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>pss=0</varname></term>
                                <listitem><para>If set to 1, enables logging and graphing
                                of processes PSS memory consumption.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>entropy=0</varname></term>
                                <listitem><para>If set to 1, enables logging and graphing
                                of the kernel random entropy pool size.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>scale_x=100</varname></term>
                                <listitem><para>Horizontal scaling factor for all variable
                                graph components.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>scale_y=20</varname></term>
                                <listitem><para>Vertical scaling factor for all variable
                                graph components.</para></listitem>
                        </varlistentry>

                </variablelist>
        </refsect1>

        <refsect1>
                  <title>See Also</title>
                  <para>
                          <citerefentry><refentrytitle>systemd-bootchart</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                  </para>
        </refsect1>

</refentry>