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12b42c7667
This did not really work out as we had hoped. Trying to do this upstream introduced several problems that probably makes it better suited as a downstream patch after all. At any rate, it is not releaseable in the current state, so we at least need to revert this before the release. * by adjusting the path to binaries, but not do the same thing to the search path we end up with inconsistent man-pages. Adjusting the search path too would be quite messy, and it is not at all obvious that this is worth the effort, but at any rate it would have to be done before we could ship this. * this means that distributed man-pages does not make sense as they depend on config options, and for better or worse we are still distributing man pages, so that is something that definitely needs sorting out before we could ship with this patch. * we have long held that split-usr is only minimally supported in order to boot, and something we hope will eventually go away. So before we start adding even more magic/effort in order to make this work nicely, we should probably question if it makes sense at all.
324 lines
12 KiB
XML
324 lines
12 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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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 tool, usually run at
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system startup, that collects the CPU load, disk load, memory
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usage, as well as per-process information from a running system.
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Collected results are output as an SVG graph. Normally,
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systemd-bootchart 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 command line. systemd-bootchart will then fork the
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real init off to resume normal system startup, while monitoring
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and logging startup 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 (usually 15-30
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seconds, default 20 s) the logging stops and a graph is
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generated from the logged information. This graph contains vital
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clues as to which resources are being used, in which order, and
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where possible problems exist in the startup sequence of the
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system. It is essentially a more detailed version of the
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<command>systemd-analyze plot</command> function.
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</para>
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<para>
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Of course, bootchart can also be used at any moment in time to
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collect and graph some data for an amount of time. It is
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recommended to use the <option>--rel</option> switch in this
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case.
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</para>
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<para>
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Bootchart does not require root privileges, and will happily run
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as a normal user.
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</para>
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<para>
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Bootchart graphs are by default written time-stamped in
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<filename>/run/log</filename> 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 the
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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> instead of the init
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process. In turn, <command>systemd-bootchart</command> will
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invoke <command>/usr/lib/systemd/systemd</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> as normal application
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from the command line. In this mode it is highly recommended
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to pass the <option>-r</option> flag in order to not graph the
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time elapsed since boot and before systemd-bootchart was
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started, as it may result in extremely large graphs. The time
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elapsed since boot 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> 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 samples,
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<replaceable>N</replaceable>, to record. Samples will be
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recorded at 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 frequency, a positive
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real <replaceable>f</replaceable>, in Hz. Most systems can
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cope with values up to 25-50 without creating too much
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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 times.
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This is useful for using bootchart at post-boot time to
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profile an already booted system. Without this option the
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graph would become extremely large. If set, the horizontal
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axis starts at the first recorded sample instead of time
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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 did not
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contribute significantly to the boot. Processes that are too
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short-lived (only seen in one sample) or that do not consume
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any significant CPU time (less than 0.001 s) will not be
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displayed in the output graph. </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
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of processes, 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 graphs.
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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>/usr/lib/systemd/systemd</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 of processes' PSS
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(Proportional Set Size) memory consumption. See
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<filename>filesystems/proc.txt</filename> in the kernel
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documentation for an 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 of the kernel
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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 graph
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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.
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In order to render those on a graphical display any SVG capable
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viewer can be used. It should be noted that the SVG render engines
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in most browsers (including Chrome and Firefox) are many times
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faster than dedicated graphical applications like Gimp and
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Inkscape. Just point your browser at
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<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 scratch, but
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is inspired by former bootchart 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 not
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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 a
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fast and efficient data logger, but also did not graph the
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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 for
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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
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data collection and the charting into a single application, making
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it more efficient and simpler. There are no longer any timing
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issues with the data collector and the grapher, as the graphing
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cannot be run until the data has been collected. Also, the data
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kept in memory is reduced to the absolute 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
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hard drive unless the root device is specified with
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<code>root=/dev/sdxY</code>. Using UUIDs or PARTUUIDs will boot
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fine, but the hard drive model will not be added to the
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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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