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6 <title>Petter Reinholdtsen: Quicker Debian installations using eatmydata</title>
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14 <h1>
15 <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
16
17 </h1>
18
19 </div>
20
21
22 <div class="entry">
23 <div class="title">Quicker Debian installations using eatmydata</div>
24 <div class="date">25th November 2016</div>
25 <div class="body"><p>Two years ago, I did some experiments with eatmydata and the Debian
26 installation system, observing how using
27 <a href="http://people.skolelinux.org/pere/blog/Speeding_up_the_Debian_installer_using_eatmydata_and_dpkg_divert.html">eatmydata
28 could speed up the installation</a> quite a bit. My testing measured
29 speedup around 20-40 percent for Debian Edu, where we install around
30 1000 packages from within the installer. The eatmydata package
31 provide a way to disable/delay file system flushing. This is a bit
32 risky in the general case, as files that should be stored on disk will
33 stay only in memory a bit longer than expected, causing problems if a
34 machine crashes at an inconvenient time. But for an installation, if
35 the machine crashes during installation the process is normally
36 restarted, and avoiding disk operations as much as possible to speed
37 up the process make perfect sense.
38
39 <p>I added code in the Debian Edu specific installation code to enable
40 <a href="https://tracker.debian.org/pkg/libeatmydata">eatmydata</a>,
41 but did not have time to push it any further. But a few months ago I
42 picked it up again and worked with the libeatmydata package maintainer
43 Mattia Rizzolo to make it easier for everyone to get this installation
44 speedup in Debian. Thanks to our cooperation There is now an
45 eatmydata-udeb package in Debian testing and unstable, and simply
46 enabling/installing it in debian-installer (d-i) is enough to get the
47 quicker installations. It can be enabled using preseeding. The
48 following untested kernel argument should do the trick:</p>
49
50 <blockquote><pre>
51 preseed/early_command="anna-install eatmydata-udeb"
52 </pre></blockquote>
53
54 <p>This should ask d-i to install the package inside the d-i
55 environment early in the installation sequence. Having it installed
56 in d-i in turn will make sure the relevant scripts are called just
57 after debootstrap filled /target/ with the freshly installed Debian
58 system to configure apt to run dpkg with eatmydata. This is enough to
59 speed up the installation process. There is a proposal to
60 <a href="https://bugs.debian.org/841153">extend the idea a bit further
61 by using /etc/ld.so.preload instead of apt.conf</a>, but I have not
62 tested its impact.</p>
63
64 </div>
65
66 <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.</div>
67
68
69 </div>
70
71
72
73
74 <div id="sidebar">
75
76
77
78 <h2>Archive</h2>
79 <ul>
80
81 <li>2017
82 <ul>
83
84 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
85
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89
90 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/04/">April (2)</a></li>
91
92 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/06/">June (5)</a></li>
93
94 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/07/">July (1)</a></li>
95
96 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/08/">August (1)</a></li>
97
98 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/09/">September (3)</a></li>
99
100 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/10/">October (5)</a></li>
101
102 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/11/">November (1)</a></li>
103
104 </ul></li>
105
106 <li>2016
107 <ul>
108
109 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
110
111 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
112
113 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/03/">March (3)</a></li>
114
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116
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120
121 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/07/">July (2)</a></li>
122
123 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/08/">August (5)</a></li>
124
125 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/09/">September (2)</a></li>
126
127 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
128
129 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
130
131 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
132
133 </ul></li>
134
135 <li>2015
136 <ul>
137
138 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
139
140 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
141
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143
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145
146 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
147
148 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/06/">June (4)</a></li>
149
150 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
151
152 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
153
154 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
155
156 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
157
158 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
159
160 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
161
162 </ul></li>
163
164 <li>2014
165 <ul>
166
167 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
168
169 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
170
171 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
172
173 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
174
175 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
176
177 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
178
179 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
180
181 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
182
183 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
184
185 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
186
187 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
188
189 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
190
191 </ul></li>
192
193 <li>2013
194 <ul>
195
196 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
197
198 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
199
200 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
201
202 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
203
204 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
205
206 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
207
208 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
209
210 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
211
212 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
213
214 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
215
216 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
217
218 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
219
220 </ul></li>
221
222 <li>2012
223 <ul>
224
225 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
226
227 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
228
229 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
230
231 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
232
233 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
234
235 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
236
237 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
238
239 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
240
241 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
242
243 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
244
245 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
246
247 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
248
249 </ul></li>
250
251 <li>2011
252 <ul>
253
254 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
255
256 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
257
258 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
259
260 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
261
262 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
263
264 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
265
266 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
267
268 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
269
270 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
271
272 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
273
274 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
275
276 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
277
278 </ul></li>
279
280 <li>2010
281 <ul>
282
283 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
284
285 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
286
287 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
288
289 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
290
291 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
292
293 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
294
295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
296
297 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
298
299 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
300
301 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
302
303 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
304
305 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
306
307 </ul></li>
308
309 <li>2009
310 <ul>
311
312 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
313
314 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
315
316 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
317
318 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
319
320 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
321
322 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
323
324 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
325
326 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
327
328 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
329
330 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
331
332 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
333
334 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
335
336 </ul></li>
337
338 <li>2008
339 <ul>
340
341 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
342
343 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
344
345 </ul></li>
346
347 </ul>
348
349
350
351 <h2>Tags</h2>
352 <ul>
353
354 <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (14)</a></li>
355
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357
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359
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361
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365
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367
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369
370 <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (154)</a></li>
371
372 <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
373
374 <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
375
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377
378 <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
379
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381
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383
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385
386 <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
387
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389
390 <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (30)</a></li>
391
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393
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395
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397
398 <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
399
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401
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403
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405
406 <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
407
408 <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
409
410 <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
411
412 <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
413
414 <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
415
416 <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (39)</a></li>
417
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419
420 <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (293)</a></li>
421
422 <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (189)</a></li>
423
424 <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (33)</a></li>
425
426 <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
427
428 <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (65)</a></li>
429
430 <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (104)</a></li>
431
432 <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
433
434 <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
435
436 <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
437
438 <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
439
440 <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (10)</a></li>
441
442 <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
443
444 <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (5)</a></li>
445
446 <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
447
448 <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (53)</a></li>
449
450 <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
451
452 <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
453
454 <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (55)</a></li>
455
456 <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
457
458 <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
459
460 <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (52)</a></li>
461
462 <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
463
464 <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
465
466 <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
467
468 <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (59)</a></li>
469
470 <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
471
472 <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (40)</a></li>
473
474 </ul>
475
476
477 </div>
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