man/bootchart.conf.xml

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<refentry id="bootchart.conf" conditional='ENABLE_BOOTCHART'>
        <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 in total before bootchart exits. Each sample will
                                record at intervals defined by Frequency=.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>Frequency=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>Relative=no</varname></term>
                                <listitem><para>Configures whether the left axis of the
                                output graph equals time=0.0 (<constant>CLOCK_MONOTONIC</constant> 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 yes, the horizontal axis starts
                                at the first recorded sample instead of time=0.0.
                                </para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>Filter=no</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 directory for writing
                                the graphs. By default, bootchart writes the graphs to
                                <filename>/run/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>PlotMemoryUsage=no</varname></term>
                                <listitem><para>If set to yes, enables logging and graphing
                                of processes' PSS memory consumption.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>PlotEntropyGraph=no</varname></term>
                                <listitem><para>If set to yes, enables logging and graphing
                                of the kernel random entropy pool size.</para></listitem>
                        </varlistentry>

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

                        <varlistentry>
                                <term><varname>ScaleY=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>,
                          <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
                  </para>
        </refsect1>

</refentry>