blog/Debian_boots_quicker_and_quicker.html

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   6     <title>Petter Reinholdtsen: Debian boots quicker and quicker</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">Debian boots quicker and quicker</div>
  24       <div class="date">24th June 2009</div>
  25       <div class="body"><p>I spent Monday and tuesday this week in London with a lot of the
  26 people involved in the boot system on Debian and Ubuntu, to see if we
  27 could find more ways to speed up the boot system.  This was an Ubuntu
  28 funded
  29 <a href="https://wiki.ubuntu.com/FoundationsTeam/BootPerformance/DebianUbuntuSprint">developer
  30 gathering</a>. It was quite productive.  We also discussed the future
  31 of boot systems, and ways to handle the increasing number of boot
  32 issues introduced by the Linux kernel becoming more and more
  33 asynchronous and event base.  The Ubuntu approach using udev and
  34 upstart might be a good way forward.  Time will show.</p>
  35
  36 <p>Anyway, there are a few ways at the moment to speed up the boot
  37 process in Debian.  All of these should be applied to get a quick
  38 boot:</p>
  39
  40 <ul>
  41
  42 <li>Use dash as /bin/sh.</li>
  43
  44 <li>Disable the init.d/hwclock*.sh scripts and make sure the hardware
  45    clock is in UTC.</li>
  46
  47 <li>Install and activate the insserv package to enable
  48    <a href="http://wiki.debian.org/LSBInitScripts/DependencyBasedBoot">dependency
  49    based boot sequencing</a>, and enable concurrent booting.</li>
  50
  51 </ul>
  52
  53 These points are based on the Google summer of code work done by
  54 <a href="http://initscripts-ng.alioth.debian.org/soc2006-bootsystem/">Carlos
  55 Villegas</a>.
  56
  57 <p>Support for makefile-style concurrency during boot was uploaded to
  58 unstable yesterday.  When we tested it, we were able to cut 6 seconds
  59 from the boot sequence.  It depend on very correct dependency
  60 declaration in all init.d scripts, so I expect us to find edge cases
  61 where the dependences in some scripts are slightly wrong when we start
  62 using this.</p>
  63
  64 <p>On our IRC channel for this effort, #pkg-sysvinit, a new idea was
  65 introduced by Raphael Geissert today, one that could affect the
  66 startup speed as well.  Instead of starting some scripts concurrently
  67 from rcS.d/ and another set of scripts from rc2.d/, it would be
  68 possible to run a of them in the same process.  A quick way to test
  69 this would be to enable insserv and run 'mv /etc/rc2.d/S* /etc/rcS.d/;
  70 insserv'.  Will need to test if that work. :)</p>
  71 </div>
  72
  73       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem</a>, <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.</div>
  74
  75
  76     </div>
  77
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  81     <div id="sidebar">
  82
  83
  84
  85 <h2>Archive</h2>
  86 <ul>
  87
  88 <li>2020
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 154
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 156
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 158
 159 </ul></li>
 160
 161 <li>2017
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 214
 215 </ul></li>
 216
 217 <li>2015
 218 <ul>
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 241
 242 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 243
 244 </ul></li>
 245
 246 <li>2014
 247 <ul>
 248
 249 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 250
 251 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 252
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 254
 255 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 256
 257 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 258
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 260
 261 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 262
 263 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 264
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 269 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 270
 271 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 272
 273 </ul></li>
 274
 275 <li>2013
 276 <ul>
 277
 278 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 279
 280 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
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 291
 292 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 293
 294 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 295
 296 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 297
 298 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 299
 300 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 301
 302 </ul></li>
 303
 304 <li>2012
 305 <ul>
 306
 307 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 308
 309 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 310
 311 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
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 313 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 314
 315 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 316
 317 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 318
 319 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 320
 321 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 322
 323 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 324
 325 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
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 327 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 328
 329 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 330
 331 </ul></li>
 332
 333 <li>2011
 334 <ul>
 335
 336 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 337
 338 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 339
 340 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 341
 342 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 343
 344 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 345
 346 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 347
 348 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
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 350 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
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 354 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
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 357
 358 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 359
 360 </ul></li>
 361
 362 <li>2010
 363 <ul>
 364
 365 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 366
 367 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 368
 369 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
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 386
 387 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 388
 389 </ul></li>
 390
 391 <li>2009
 392 <ul>
 393
 394 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 395
 396 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
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 398 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
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 400 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
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 402 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
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 404 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
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 406 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
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 410 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
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 412 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
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 414 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 415
 416 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 417
 418 </ul></li>
 419
 420 <li>2008
 421 <ul>
 422
 423 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 424
 425 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 426
 427 </ul></li>
 428
 429 </ul>
 430
 431
 432
 433 <h2>Tags</h2>
 434 <ul>
 435
 436  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 437
 438  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 439
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 441
 442  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 443
 444  <li><a href="http://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 445
 446  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (11)</a></li>
 447
 448  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 449
 450  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 451
 452  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 453
 454  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (174)</a></li>
 455
 456  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (159)</a></li>
 457
 458  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (7)</a></li>
 459
 460  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
 461
 462  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
 463
 464  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (26)</a></li>
 465
 466  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 467
 468  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (421)</a></li>
 469
 470  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 471
 472  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (14)</a></li>
 473
 474  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (34)</a></li>
 475
 476  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 477
 478  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 479
 480  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 481
 482  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (43)</a></li>
 483
 484  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 485
 486  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (22)</a></li>
 487
 488  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 489
 490  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 491
 492  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 493
 494  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 495
 496  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 497
 498  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 499
 500  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 501
 502  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (42)</a></li>
 503
 504  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (13)</a></li>
 505
 506  <li><a href="http://people.skolelinux.org/pere/blog/tags/noark5">noark5 (22)</a></li>
 507
 508  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (314)</a></li>
 509
 510  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (197)</a></li>
 511
 512  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (38)</a></li>
 513
 514  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 515
 516  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (75)</a></li>
 517
 518  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (111)</a></li>
 519
 520  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 521
 522  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 523
 524  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 525
 526  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 527
 528  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (12)</a></li>
 529
 530  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 531
 532  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 533
 534  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 535
 536  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (58)</a></li>
 537
 538  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 539
 540  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 541
 542  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (70)</a></li>
 543
 544  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
 545
 546  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 547
 548  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (60)</a></li>
 549
 550  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (5)</a></li>
 551
 552  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 553
 554  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 555
 556  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (18)</a></li>
 557
 558  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (74)</a></li>
 559
 560  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 561
 562  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 563
 564 </ul>
 565
 566
 567     </div>
 568     <p style="text-align: right">
 569  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 570 </p>
 571
 572   </body>
 573 </html>