… | |
… | |
25 | <tbody valign="top"> |
25 | <tbody valign="top"> |
26 | <tr class="field"><th class="field-name">GLEP:</th><td class="field-body">61</td> |
26 | <tr class="field"><th class="field-name">GLEP:</th><td class="field-body">61</td> |
27 | </tr> |
27 | </tr> |
28 | <tr class="field"><th class="field-name">Title:</th><td class="field-body">Manifest2 compression</td> |
28 | <tr class="field"><th class="field-name">Title:</th><td class="field-body">Manifest2 compression</td> |
29 | </tr> |
29 | </tr> |
30 | <tr class="field"><th class="field-name">Version:</th><td class="field-body">1.4</td> |
30 | <tr class="field"><th class="field-name">Version:</th><td class="field-body">1.5</td> |
31 | </tr> |
31 | </tr> |
32 | <tr class="field"><th class="field-name">Last-Modified:</th><td class="field-body"><a class="reference external" href="http://www.gentoo.org/cgi-bin/viewcvs.cgi/xml/htdocs/proj/en/glep/glep-0061.txt?cvsroot=gentoo">2010/01/13 03:26:53</a></td> |
32 | <tr class="field"><th class="field-name">Last-Modified:</th><td class="field-body"><a class="reference external" href="http://www.gentoo.org/cgi-bin/viewcvs.cgi/xml/htdocs/proj/en/glep/glep-0061.txt?cvsroot=gentoo">2010/01/31 08:27:05</a></td> |
33 | </tr> |
33 | </tr> |
34 | <tr class="field"><th class="field-name">Author:</th><td class="field-body">Robin Hugh Johnson <robbat2 at gentoo.org></td> |
34 | <tr class="field"><th class="field-name">Author:</th><td class="field-body">Robin Hugh Johnson <robbat2 at gentoo.org></td> |
35 | </tr> |
35 | </tr> |
36 | <tr class="field"><th class="field-name">Status:</th><td class="field-body">Draft</td> |
36 | <tr class="field"><th class="field-name">Status:</th><td class="field-body">Draft</td> |
37 | </tr> |
37 | </tr> |
… | |
… | |
45 | </tr> |
45 | </tr> |
46 | <tr class="field"><th class="field-name">Updated:</th><td class="field-body">October 2008, January 2010</td> |
46 | <tr class="field"><th class="field-name">Updated:</th><td class="field-body">October 2008, January 2010</td> |
47 | </tr> |
47 | </tr> |
48 | <tr class="field"><th class="field-name">Updates:</th><td class="field-body">44</td> |
48 | <tr class="field"><th class="field-name">Updates:</th><td class="field-body">44</td> |
49 | </tr> |
49 | </tr> |
50 | <tr class="field"><th class="field-name">Post-History:</th><td class="field-body">December 2009</td> |
50 | <tr class="field"><th class="field-name">Post-History:</th><td class="field-body">December 2009, January 2010</td> |
51 | </tr> |
51 | </tr> |
52 | </tbody> |
52 | </tbody> |
53 | </table> |
53 | </table> |
54 | <hr /> |
54 | <hr /> |
55 | <div class="contents topic" id="contents"> |
55 | <div class="contents topic" id="contents"> |
56 | <p class="topic-title first">Contents</p> |
56 | <p class="topic-title first">Contents</p> |
57 | <ul class="simple"> |
57 | <ul class="simple"> |
58 | <li><a class="reference internal" href="#abstract" id="id1">Abstract</a></li> |
58 | <li><a class="reference internal" href="#abstract" id="id1">Abstract</a></li> |
59 | <li><a class="reference internal" href="#motivation" id="id2">Motivation</a></li> |
59 | <li><a class="reference internal" href="#motivation" id="id2">Motivation</a></li> |
60 | <li><a class="reference internal" href="#specification" id="id3">Specification</a></li> |
60 | <li><a class="reference internal" href="#specification" id="id3">Specification</a><ul> |
|
|
61 | <li><a class="reference internal" href="#creation-of-compressed-manifests" id="id4">Creation of compressed Manifests:</a></li> |
|
|
62 | <li><a class="reference internal" href="#validation-of-manifests" id="id5">Validation of Manifests:</a></li> |
|
|
63 | </ul> |
|
|
64 | </li> |
|
|
65 | <li><a class="reference internal" href="#example-results-with-a-32kib-cut-off-gzip-algorithm" id="id6">Example Results with a 32KiB cut-off, gzip algorithm</a></li> |
61 | <li><a class="reference internal" href="#backwards-compatibility" id="id4">Backwards Compatibility</a></li> |
66 | <li><a class="reference internal" href="#backwards-compatibility" id="id7">Backwards Compatibility</a></li> |
62 | <li><a class="reference internal" href="#references" id="id5">References</a></li> |
67 | <li><a class="reference internal" href="#references" id="id8">References</a></li> |
63 | <li><a class="reference internal" href="#copyright" id="id6">Copyright</a></li> |
68 | <li><a class="reference internal" href="#copyright" id="id9">Copyright</a></li> |
64 | </ul> |
69 | </ul> |
65 | </div> |
70 | </div> |
66 | <div class="section" id="abstract"> |
71 | <div class="section" id="abstract"> |
67 | <h1><a class="toc-backref" href="#id1">Abstract</a></h1> |
72 | <h1><a class="toc-backref" href="#id1">Abstract</a></h1> |
68 | <p>Deals with compression of large Manifest2 files.</p> |
73 | <p>Deals with compression of large Manifest2 files.</p> |
… | |
… | |
70 | <div class="section" id="motivation"> |
75 | <div class="section" id="motivation"> |
71 | <h1><a class="toc-backref" href="#id2">Motivation</a></h1> |
76 | <h1><a class="toc-backref" href="#id2">Motivation</a></h1> |
72 | <p>With the introduction of MetaManifest, and full-tree Manifest coverage, |
77 | <p>With the introduction of MetaManifest, and full-tree Manifest coverage, |
73 | we are faced with the possibility of having very large Manifests.</p> |
78 | we are faced with the possibility of having very large Manifests.</p> |
74 | <p>Preliminary experiments with MetaManifest, show that with just the |
79 | <p>Preliminary experiments with MetaManifest, show that with just the |
75 | existing per-package Manifests, the full MetaManifest, for a tree |
80 | existing per-package Manifests, the full MetaManifest (top-level only, |
76 | including metadata/, exceeds 8MiB in size. Applying common compression |
81 | no first-level sub directories), for a tree including metadata/, exceeds |
77 | can achieve a 50-60% reduction in this size.</p> |
82 | 8MiB in size. Applying common compression can achieve a 50-60% reduction |
|
|
83 | in this size.</p> |
|
|
84 | <p>Additionally, some of the larger already-existing Manifests in the tree |
|
|
85 | can also be reduced.</p> |
78 | </div> |
86 | </div> |
79 | <div class="section" id="specification"> |
87 | <div class="section" id="specification"> |
80 | <h1><a class="toc-backref" href="#id3">Specification</a></h1> |
88 | <h1><a class="toc-backref" href="#id3">Specification</a></h1> |
|
|
89 | <div class="section" id="creation-of-compressed-manifests"> |
|
|
90 | <h2><a class="toc-backref" href="#id4">Creation of compressed Manifests:</a></h2> |
|
|
91 | <p>32KiB is suggested as a arbitrary cut-off point to start generating |
|
|
92 | compressed Manifest2 files.</p> |
|
|
93 | <p>The compression must only applied during the creation of a tree intended |
|
|
94 | for end users. No Manifests stored in a VCS should be compressed in the |
|
|
95 | VCS. For the main gentoo-portage tree, this means that the compressed |
|
|
96 | Manifests should be generated using the CVS to Rsync process.</p> |
|
|
97 | <p>The Manifest compression process is required to ensure that inconsistent |
|
|
98 | compressed versions do not exist.</p> |
|
|
99 | </div> |
|
|
100 | <div class="section" id="validation-of-manifests"> |
|
|
101 | <h2><a class="toc-backref" href="#id5">Validation of Manifests:</a></h2> |
81 | <p>When searching for a Manifest2 file, if the basename form does not |
102 | <p>When searching for a Manifest2 file, if the basename form does not |
82 | exist, the package manager should search in the same location using |
103 | exist, the package manager should search in the same location using |
83 | common compressed suffixes, and use the compressed file in place of the |
104 | common compressed suffixes, and use the compressed file in place of the |
84 | Manifest2.</p> |
105 | Manifest2.</p> |
85 | <p>gzip, bzip2, lzma, xz should all be supported if available on the given |
106 | <p>gzip, bzip2, lzma, xz should all be supported if available on the given |
86 | platform. In the case that multiple versions exist, the package manager |
107 | platform. In the case that multiple versions exist, the package manager |
87 | should simply pick one - they should be identical, differing only in |
108 | should simply pick one - they should be identical, differing only in |
88 | compression.</p> |
109 | compression.</p> |
89 | <p>The Manifest generation process is required to ensure that inconsistent |
110 | </div> |
90 | compressed versions do not exist.</p> |
111 | </div> |
|
|
112 | <div class="section" id="example-results-with-a-32kib-cut-off-gzip-algorithm"> |
|
|
113 | <h1><a class="toc-backref" href="#id6">Example Results with a 32KiB cut-off, gzip algorithm</a></h1> |
|
|
114 | <p>As of 2010/01/30, the suggested cut-off would impact the following 21 existing |
|
|
115 | Manifests, for a saving of nearly 900KiB:</p> |
|
|
116 | <pre class="literal-block"> |
|
|
117 | Size Path |
|
|
118 | 65788 app-doc/linux-gazette/Manifest |
|
|
119 | 75739 app-office/openoffice-bin/Manifest |
|
|
120 | 40534 app-text/texlive-core/Manifest |
|
|
121 | 41710 dev-texlive/texlive-bibtexextra/Manifest |
|
|
122 | 38197 dev-texlive/texlive-documentation-english/Manifest |
|
|
123 | 129610 dev-texlive/texlive-fontsextra/Manifest |
|
|
124 | 36022 dev-texlive/texlive-humanities/Manifest |
|
|
125 | 686118 dev-texlive/texlive-latexextra/Manifest |
|
|
126 | 43392 dev-texlive/texlive-latexrecommended/Manifest |
|
|
127 | 33375 dev-texlive/texlive-mathextra/Manifest |
|
|
128 | 39781 dev-texlive/texlive-pictures/Manifest |
|
|
129 | 69567 dev-texlive/texlive-pstricks/Manifest |
|
|
130 | 75460 dev-texlive/texlive-publishers/Manifest |
|
|
131 | 50879 dev-texlive/texlive-science/Manifest |
|
|
132 | 36711 kde-base/kde-l10n/Manifest |
|
|
133 | 36539 media-gfx/bootsplash-themes/Manifest |
|
|
134 | 33058 net-fs/autofs/Manifest |
|
|
135 | 39781 www-client/firefox-bin/Manifest |
|
|
136 | 48983 www-client/icecat/Manifest |
|
|
137 | 60213 www-client/mozilla-firefox/Manifest |
|
|
138 | 39065 x11-themes/gkrellm-themes/Manifest |
|
|
139 | </pre> |
|
|
140 | <p>Additionally, with the MetaManifest proposal, the following new manifests would |
|
|
141 | also be compressed, for a saving of nearly 4MiB:</p> |
|
|
142 | <pre class="literal-block"> |
|
|
143 | Size Path |
|
|
144 | 33442 app-admin/Manifest |
|
|
145 | 71073 app-dicts/Manifest |
|
|
146 | 35923 app-emacs/Manifest |
|
|
147 | 45808 app-misc/Manifest |
|
|
148 | 50169 app-text/Manifest |
|
|
149 | 112786 dev-java/Manifest |
|
|
150 | 65581 dev-libs/Manifest |
|
|
151 | 42619 dev-lisp/Manifest |
|
|
152 | 182163 dev-perl/Manifest |
|
|
153 | 96198 dev-python/Manifest |
|
|
154 | 58963 dev-ruby/Manifest |
|
|
155 | 59736 dev-util/Manifest |
|
|
156 | 58338 eclass/Manifest |
|
|
157 | 55749 kde-base/Manifest |
|
|
158 | 110064 licenses/Manifest |
|
|
159 | 35262 media-gfx/Manifest |
|
|
160 | 53995 media-libs/Manifest |
|
|
161 | 55607 media-plugins/Manifest |
|
|
162 | 71911 media-sound/Manifest |
|
|
163 | 34835 media-video/Manifest |
|
|
164 | 5747849 metadata/Manifest |
|
|
165 | 47452 net-analyzer/Manifest |
|
|
166 | 65989 net-misc/Manifest |
|
|
167 | 316787 profiles/Manifest |
|
|
168 | 67784 sys-apps/Manifest |
|
|
169 | 48971 x11-misc/Manifest |
|
|
170 | 41475 x11-plugins/Manifest |
|
|
171 | </pre> |
91 | </div> |
172 | </div> |
92 | <div class="section" id="backwards-compatibility"> |
173 | <div class="section" id="backwards-compatibility"> |
93 | <h1><a class="toc-backref" href="#id4">Backwards Compatibility</a></h1> |
174 | <h1><a class="toc-backref" href="#id7">Backwards Compatibility</a></h1> |
94 | <p>The package Manifests should also be maintained as ONLY uncompressed in |
175 | <p>The package Manifests should also be maintained as ONLY uncompressed in |
95 | CVS.</p> |
176 | CVS.</p> |
96 | <p>For processing of all existing per-package Manifests, if compression is |
177 | <p>For processing of all existing per-package Manifests, if compression is |
97 | used, it should be done in parallel to the existing Manifests, to |
178 | used, it should be done in parallel to the existing Manifests, to |
98 | provide for a changeover period. Newer versions of Portage may later |
179 | provide for a changeover period. Newer versions of Portage may later |
… | |
… | |
100 | compressed versions are guaranteed to exist on the servers.</p> |
181 | compressed versions are guaranteed to exist on the servers.</p> |
101 | <p>MetaManifests may come into existence as compressed from the start, as |
182 | <p>MetaManifests may come into existence as compressed from the start, as |
102 | do not have an backwards compatibility issues.</p> |
183 | do not have an backwards compatibility issues.</p> |
103 | <p>As a side note, this breaks all manual interaction with Manifests |
184 | <p>As a side note, this breaks all manual interaction with Manifests |
104 | such as grep, and so should only be applied to large Manifest2 files, |
185 | such as grep, and so should only be applied to large Manifest2 files, |
105 | such as the MetaManifest. 384KiB is suggested as a arbitrary cut-off |
186 | such as the MetaManifest.</p> |
106 | point to start generating compressed Manifest2 files.</p> |
|
|
107 | </div> |
187 | </div> |
108 | <div class="section" id="references"> |
188 | <div class="section" id="references"> |
109 | <h1><a class="toc-backref" href="#id5">References</a></h1> |
189 | <h1><a class="toc-backref" href="#id8">References</a></h1> |
110 | <table class="docutils footnote" frame="void" id="glep44" rules="none"> |
190 | <table class="docutils footnote" frame="void" id="glep44" rules="none"> |
111 | <colgroup><col class="label" /><col /></colgroup> |
191 | <colgroup><col class="label" /><col /></colgroup> |
112 | <tbody valign="top"> |
192 | <tbody valign="top"> |
113 | <tr><td class="label">[1]</td><td>Mauch, M. (2005) GLEP44 - Manifest2 format. |
193 | <tr><td class="label">[1]</td><td>Mauch, M. (2005) GLEP44 - Manifest2 format. |
114 | <a class="reference external" href="http://www.gentoo.org/proj/en/glep/glep-0044.html">http://www.gentoo.org/proj/en/glep/glep-0044.html</a></td></tr> |
194 | <a class="reference external" href="http://www.gentoo.org/proj/en/glep/glep-0044.html">http://www.gentoo.org/proj/en/glep/glep-0044.html</a></td></tr> |
115 | </tbody> |
195 | </tbody> |
116 | </table> |
196 | </table> |
117 | </div> |
197 | </div> |
118 | <div class="section" id="copyright"> |
198 | <div class="section" id="copyright"> |
119 | <h1><a class="toc-backref" href="#id6">Copyright</a></h1> |
199 | <h1><a class="toc-backref" href="#id9">Copyright</a></h1> |
120 | <p>Copyright (c) 2008-2010 by Robin Hugh Johnson. This material may be |
200 | <p>Copyright (c) 2008-2010 by Robin Hugh Johnson. This material may be |
121 | distributed only subject to the terms and conditions set forth in the |
201 | distributed only subject to the terms and conditions set forth in the |
122 | Open Publication License, v1.0.</p> |
202 | Open Publication License, v1.0.</p> |
123 | <p>vim: tw=72 ts=2 expandtab:</p> |
203 | <p>vim: tw=72 ts=2 expandtab:</p> |
124 | </div> |
204 | </div> |
125 | |
205 | |
126 | </div> |
206 | </div> |
127 | <div class="footer"> |
207 | <div class="footer"> |
128 | <hr class="footer" /> |
208 | <hr class="footer" /> |
129 | <a class="reference external" href="glep-0061.txt">View document source</a>. |
209 | <a class="reference external" href="glep-0061.txt">View document source</a>. |
130 | Generated on: 2010-01-13 03:27 UTC. |
210 | Generated on: 2010-01-31 08:27 UTC. |
131 | Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source. |
211 | Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source. |
132 | |
212 | |
133 | </div> |
213 | </div> |
134 | </body> |
214 | </body> |
135 | </html> |
215 | </html> |