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authorScott Rifenbark <srifenbark@gmail.com>2018-01-23 11:29:22 -0800
committerRichard Purdie <richard.purdie@linuxfoundation.org>2018-02-14 15:25:29 +0000
commit30b91e6d891fbfa6a44487a27b8ceb5618157614 (patch)
treea55464032253d643fc4ceec7952cc32e656fdc26 /documentation/ref-manual/usingpoky.xml
parent355103f8cf2295fb2de91ce25a084e286bdeadeb (diff)
downloadpoky-30b91e6d891fbfa6a44487a27b8ceb5618157614.tar.gz
documentation: Removed "usingpoky" chapter from ref-manual
Fixes [YOCTO #12370] All of the information from the "usingpoky" chapter in the ref-manual has been distributed out over the rest of the YP manual set. Primarily, this information went into the dev-manual and the overview-manual. Because the chapter is no more, I had to update the mega-manual.xml to not include that chapter. Also, had to update ref-manual to exclude the chapter as part of the Make process. (From yocto-docs rev: b988cab06d42f0ac2220cefe66949c5ab6cbf803) Signed-off-by: Scott Rifenbark <srifenbark@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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1<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
2"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
3[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
4
5<chapter id='usingpoky'>
6<title>Using the Yocto Project</title>
7
8 <para>
9 This chapter describes common usage for the Yocto Project.
10 The information is introductory in nature as other manuals in the Yocto Project
11 documentation set provide more details on how to use the Yocto Project.
12 </para>
13
14
15
16OLD START WAS HERE.
17
18
19OLD END WAS HERE.
20
21
22<section id='speeding-up-the-build'>
23 <title>Speeding Up the Build</title>
24
25 <para>
26 Build time can be an issue.
27 By default, the build system uses simple controls to try and maximize
28 build efficiency.
29 In general, the default settings for all the following variables
30 result in the most efficient build times when dealing with single
31 socket systems (i.e. a single CPU).
32 If you have multiple CPUs, you might try increasing the default
33 values to gain more speed.
34 See the descriptions in the glossary for each variable for more
35 information:
36 <itemizedlist>
37 <listitem><para>
38 <link linkend='var-BB_NUMBER_THREADS'><filename>BB_NUMBER_THREADS</filename>:</link>
39 The maximum number of threads BitBake simultaneously executes.
40 </para></listitem>
41 <listitem><para>
42 <ulink url='&YOCTO_DOCS_BB_URL;#var-BB_NUMBER_PARSE_THREADS'><filename>BB_NUMBER_PARSE_THREADS</filename>:</ulink>
43 The number of threads BitBake uses during parsing.
44 </para></listitem>
45 <listitem><para>
46 <link linkend='var-PARALLEL_MAKE'><filename>PARALLEL_MAKE</filename>:</link>
47 Extra options passed to the <filename>make</filename> command
48 during the
49 <link linkend='ref-tasks-compile'><filename>do_compile</filename></link>
50 task in order to specify parallel compilation on the
51 local build host.
52 </para></listitem>
53 <listitem><para>
54 <link linkend='var-PARALLEL_MAKEINST'><filename>PARALLEL_MAKEINST</filename>:</link>
55 Extra options passed to the <filename>make</filename> command
56 during the
57 <link linkend='ref-tasks-install'><filename>do_install</filename></link>
58 task in order to specify parallel installation on the
59 local build host.
60 </para></listitem>
61 </itemizedlist>
62 As mentioned, these variables all scale to the number of processor
63 cores available on the build system.
64 For single socket systems, this auto-scaling ensures that the build
65 system fundamentally takes advantage of potential parallel operations
66 during the build based on the build machine's capabilities.
67 </para>
68
69 <para>
70 Following are additional factors that can affect build speed:
71 <itemizedlist>
72 <listitem><para>
73 File system type:
74 The file system type that the build is being performed on can
75 also influence performance.
76 Using <filename>ext4</filename> is recommended as compared
77 to <filename>ext2</filename> and <filename>ext3</filename>
78 due to <filename>ext4</filename> improved features
79 such as extents.
80 </para></listitem>
81 <listitem><para>
82 Disabling the updating of access time using
83 <filename>noatime</filename>:
84 The <filename>noatime</filename> mount option prevents the
85 build system from updating file and directory access times.
86 </para></listitem>
87 <listitem><para>
88 Setting a longer commit:
89 Using the "commit=" mount option increases the interval
90 in seconds between disk cache writes.
91 Changing this interval from the five second default to
92 something longer increases the risk of data loss but decreases
93 the need to write to the disk, thus increasing the build
94 performance.
95 </para></listitem>
96 <listitem><para>
97 Choosing the packaging backend:
98 Of the available packaging backends, IPK is the fastest.
99 Additionally, selecting a singular packaging backend also
100 helps.
101 </para></listitem>
102 <listitem><para>
103 Using <filename>tmpfs</filename> for
104 <link linkend='var-TMPDIR'><filename>TMPDIR</filename></link>
105 as a temporary file system:
106 While this can help speed up the build, the benefits are
107 limited due to the compiler using
108 <filename>-pipe</filename>.
109 The build system goes to some lengths to avoid
110 <filename>sync()</filename> calls into the
111 file system on the principle that if there was a significant
112 failure, the
113 <link linkend='build-directory'>Build Directory</link>
114 contents could easily be rebuilt.
115 </para></listitem>
116 <listitem><para>
117 Inheriting the
118 <link linkend='ref-classes-rm-work'><filename>rm_work</filename></link>
119 class:
120 Inheriting this class has shown to speed up builds due to
121 significantly lower amounts of data stored in the data
122 cache as well as on disk.
123 Inheriting this class also makes cleanup of
124 <link linkend='var-TMPDIR'><filename>TMPDIR</filename></link>
125 faster, at the expense of being easily able to dive into the
126 source code.
127 File system maintainers have recommended that the fastest way
128 to clean up large numbers of files is to reformat partitions
129 rather than delete files due to the linear nature of partitions.
130 This, of course, assumes you structure the disk partitions and
131 file systems in a way that this is practical.
132 </para></listitem>
133 </itemizedlist>
134 Aside from the previous list, you should keep some trade offs in
135 mind that can help you speed up the build:
136 <itemizedlist>
137 <listitem><para>
138 Remove items from
139 <link linkend='var-DISTRO_FEATURES'><filename>DISTRO_FEATURES</filename></link>
140 that you might not need.
141 </para></listitem>
142 <listitem><para>
143 Exclude debug symbols and other debug information:
144 If you do not need these symbols and other debug information,
145 disabling the <filename>*-dbg</filename> package generation
146 can speed up the build.
147 You can disable this generation by setting the
148 <link linkend='var-INHIBIT_PACKAGE_DEBUG_SPLIT'><filename>INHIBIT_PACKAGE_DEBUG_SPLIT</filename></link>
149 variable to "1".
150 </para></listitem>
151 <listitem><para>
152 Disable static library generation for recipes derived from
153 <filename>autoconf</filename> or <filename>libtool</filename>:
154 Following is an example showing how to disable static
155 libraries and still provide an override to handle exceptions:
156 <literallayout class='monospaced'>
157 STATICLIBCONF = "--disable-static"
158 STATICLIBCONF_sqlite3-native = ""
159 EXTRA_OECONF += "${STATICLIBCONF}"
160 </literallayout>
161 <note><title>Notes</title>
162 <itemizedlist>
163 <listitem><para>
164 Some recipes need static libraries in order to work
165 correctly (e.g. <filename>pseudo-native</filename>
166 needs <filename>sqlite3-native</filename>).
167 Overrides, as in the previous example, account for
168 these kinds of exceptions.
169 </para></listitem>
170 <listitem><para>
171 Some packages have packaging code that assumes the
172 presence of the static libraries.
173 If so, you might need to exclude them as well.
174 </para></listitem>
175 </itemizedlist>
176 </note>
177 </para></listitem>
178 </itemizedlist>
179 </para>
180</section>
181</chapter>
182<!--
183vim: expandtab tw=80 ts=4
184-->
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