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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

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

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<refentry id="bootchart.conf" conditional='ENABLE_BOOTCHART'
    xmlns:xi="http://www.w3.org/2001/XInclude">
  <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>
    <refname>bootchart.conf.d</refname>
    <refpurpose>Boot performance analysis graphing tool configuration files</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <para><filename>/etc/systemd/bootchart.conf</filename></para>
    <para><filename>/etc/systemd/bootchart.conf.d/*.conf</filename></para>
    <para><filename>/run/systemd/bootchart.conf.d/*.conf</filename></para>
    <para><filename>/usr/lib/systemd/bootchart.conf.d/*.conf</filename></para>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para>When starting, systemd-bootchart will read the configuration
    file <filename>/etc/systemd/bootchart.conf</filename>, followed by
    the files in the <filename>bootchart.conf.d</filename>
    directories. These configuration files determine logging
    parameters and graph output.</para>
  </refsect1>

  <xi:include href="standard-conf.xml" xpointer="main-conf" />

  <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>/usr/lib/systemd/systemd</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>

      <varlistentry>
        <term><varname>ControlGroup=no</varname></term>
        <listitem><para>Display process control group.
        </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>
