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c358d728e7
* systemd-bootchart always parses /proc/uptime, although the
information is unnecessary when --rel specified
* use /proc/uptime is overkill, since Linux 2.6.39 we have
clock_gettime(CLOCK_BOOTTIME, ...). The backend on kernel side is
get_monotonic_boottime() in both cases.
* main() uses "if (graph_start <= 0.0)" to detect that /proc is
available.
This is fragile solution as graph_start is always smaller than zero
on all systems after suspend/resume (e.g. laptops), because in this
case the system uptime includes suspend time and uptime is always
greater number than monotonic time. For example right now difference
between uptime and monotonic time is 37 hours on my laptop.
Note that main() calls log_uptime() (to parse /proc/uptime) for each
sample when it believes that /proc is not available. So on my laptop
systemd-boochars spends all live with /proc/uptime parsing +
nanosleep(), try
strace /usr/lib/systemd/systemd-bootchart
to see the never ending loop.
This patch uses access("/proc/vmstat", F_OK) to detect procfs.
338 lines
17 KiB
XML
338 lines
17 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2012 Intel Corporation
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Authors:
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Auke Kok <auke-jan.h.kok@intel.com>
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William Giokas <1007380@gmail.com>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-bootchart" conditional='ENABLE_BOOTCHART'
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-bootchart</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Auke</firstname>
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<surname>Kok</surname>
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<email>auke-jan.h.kok@intel.com</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-bootchart</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-bootchart</refname>
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<refpurpose>Boot performance graphing tool</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>systemd-bootchart</command> is a
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tool, usually run at system startup, that
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collects the CPU load, disk load, memory
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usage, as well as per-process information from
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a running system. Collected results are output
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as an SVG graph. Normally, systemd-bootchart
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is invoked by the kernel by passing
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<option>init=<filename>/usr/lib/systemd/systemd-bootchart</filename></option>
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on the kernel commandline. systemd-bootchart will then
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fork the real init off to resume normal system
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startup, while monitoring and logging startup
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information in the background.
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</para>
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<para>
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After collecting a certain amount of data
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(usually 15-30 seconds, default 20 s) the
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logging stops and a graph is generated from
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the logged information. This graph contains
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vital clues as to which resources are being used,
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in which order, and where possible problems
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exist in the startup sequence of the system.
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It is essentially a more detailed version of
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the <command>systemd-analyze plot</command>
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function.
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</para>
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<para>
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Of course, bootchart can also be used at any
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moment in time to collect and graph some data
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for an amount of time. It is
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recommended to use the <option>--rel</option>
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switch in this case.
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</para>
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<para>
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Bootchart does not require root privileges,
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and will happily run as a normal user.
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</para>
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<para>
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Bootchart graphs are by default written
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time-stamped in <filename>/run/log</filename>
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and saved to the journal with
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<varname>MESSAGE_ID=9f26aa562cf440c2b16c773d0479b518</varname>.
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Journal field <varname>BOOTCHART=</varname> contains
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the bootchart in SVG format.
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</para>
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</refsect1>
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<refsect1>
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<title>Invocation</title>
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<para><command>systemd-bootchart</command> can be invoked in several different ways:</para>
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<variablelist>
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<varlistentry>
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<term><emphasis>Kernel invocation</emphasis></term>
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<listitem><para>The kernel can invoke
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<command>systemd-bootchart</command>
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instead of the init process. In turn,
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<command>systemd-bootchart</command>
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will invoke <command>/sbin/init</command>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis>Started as a standalone program</emphasis></term>
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<listitem><para>One can execute
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<command>systemd-bootchart</command>
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as normal application from the
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commandline. In this mode it is highly
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recommended to pass the
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<option>-r</option> flag in order to
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not graph the time elapsed since boot
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and before systemd-bootchart was
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started, as it may result in extremely
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large graphs. The time elapsed since boot
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might also include any time that the system
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was suspended.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>These options can also be set in the
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<filename>/etc/systemd/bootchart.conf</filename>
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file. See
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<citerefentry project='man-pages'><refentrytitle>bootchart.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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<variablelist>
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<xi:include href="standard-options.xml" xpointer="help" />
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<varlistentry>
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<term><option>-n</option></term>
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<term><option>--sample <replaceable>N</replaceable></option></term>
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<listitem><para>Specify the number of
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samples, <replaceable>N</replaceable>,
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to record. Samples will be recorded at
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intervals defined with <option>--freq</option>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-f</option></term>
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<term><option>--freq <replaceable>f</replaceable></option></term>
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<listitem><para>Specify the sample log
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frequency, a positive real <replaceable>f</replaceable>, in Hz.
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Most systems can cope with values up to 25-50 without
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creating too much overhead.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-r</option></term>
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<term><option>--rel</option></term>
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<listitem><para>Use relative times instead of absolute
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times. This is useful for using bootchart at post-boot
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time to profile an already booted system. Without this
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option the graph would become extremely large. If set, the
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horizontal axis starts at the first recorded sample
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instead of time 0.0.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-F</option></term>
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<term><option>--no-filter</option></term>
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<listitem><para>Disable filtering of tasks that
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did not contribute significantly to the boot. Processes
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that are too short-lived (only seen in one sample) or
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that do not consume any significant CPU time (less than
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0.001 s) will not be displayed in the output graph.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-C</option></term>
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<term><option>--cmdline</option></term>
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<listitem><para>Display the full command line with arguments of processes,
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instead of only the process name.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-g</option></term>
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<term><option>--control-group</option></term>
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<listitem><para>Display process control group
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-o</option></term>
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<term><option>--output <replaceable>path</replaceable></option></term>
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<listitem><para>Specify the output directory for the
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graphs. By default, bootchart writes the graphs to
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<filename>/run/log</filename>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-i</option></term>
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<term><option>--init <replaceable>path</replaceable></option></term>
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<listitem><para>Use this init binary. Defaults to
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<command>/sbin/init</command>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-p</option></term>
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<term><option>--pss</option></term>
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<listitem><para>Enable logging and graphing
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of processes' PSS (Proportional Set Size)
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memory consumption. See <filename>filesystems/proc.txt</filename>
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in the kernel documentation for an
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explanation of this field.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-e</option></term>
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<term><option>--entropy</option></term>
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<listitem><para>Enable logging and graphing
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of the kernel random entropy pool size.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-x</option></term>
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<term><option>--scale-x <replaceable>N</replaceable></option></term>
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<listitem><para>Horizontal scaling factor for all variable
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graph components.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-y</option></term>
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<term><option>--scale-y <replaceable>N</replaceable></option></term>
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<listitem><para>Vertical scaling factor for all variable
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graph components.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Output</title>
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<para><command>systemd-bootchart</command> generates SVG graphs. In order to render those
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on a graphical display any SVG capable viewer can be used. It should be
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noted that the SVG render engines in most browsers (including Chrome
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and Firefox) are many times faster than dedicated graphical applications
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like Gimp and Inkscape. Just point your browser at <ulink url="file:///run/log/" />!
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</para>
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</refsect1>
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<refsect1>
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<title>History</title>
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<para>This version of bootchart was implemented from
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scratch, but is inspired by former bootchart
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incantations:</para>
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<variablelist>
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<varlistentry>
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<term><emphasis>Original bash</emphasis></term>
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<listitem><para>The original bash/shell code implemented
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bootchart. This version created a compressed tarball for
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processing with external applications. This version did
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not graph anything, only generated data.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis>Ubuntu C Implementation</emphasis></term>
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<listitem><para>This version replaced the shell version with
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a fast and efficient data logger, but also did not graph
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the data.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis>Java bootchart</emphasis></term>
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<listitem><para>This was the original graphing application
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for charting the data, written in java.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis>pybootchartgui.py</emphasis></term>
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<listitem><para>pybootchart created a graph from the data
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collected by either the bash or C version.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>The version of bootchart you are using now combines both the data
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collection and the charting into a single application, making it more
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efficient and simpler. There are no longer any timing issues with the data
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collector and the grapher, as the graphing cannot be run until the data
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has been collected. Also, the data kept in memory is reduced to the absolute
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minimum needed.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry project='man-pages'><refentrytitle>bootchart.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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</para>
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</refsect1>
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<refsect1>
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<title>Bugs</title>
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<para>systemd-bootchart does not get the model information for the hard drive
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unless the root device is specified with <code>root=/dev/sdxY</code>. Using
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UUIDs or PARTUUIDs will boot fine, but the hard drive model will not be
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added to the chart.</para>
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<para>For bugs, please contact the author and current maintainer:</para>
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<simplelist>
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<member>Auke Kok <email>auke-jan.h.kok@intel.com</email></member>
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</simplelist>
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</refsect1>
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</refentry>
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