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<?xml version='1.0'?> <!--*-nxml-*-->
<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
This file is part of systemd.
Copyright 2012 Intel Corporation
Authors:
Auke Kok <auke-jan.h.kok@intel.com>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
<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 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>/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>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>,
<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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