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[homepage.git] / blog / archive / 2009 / 06 / 06.rss

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@@ -44,5 +44,60 @@ inneholdt i Iran hvis de ikke hadde hemmelige valg?</p>
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+       <item>
+               <title>Debian boots quicker and quicker</title>
+               <link>../../../Debian_boots_quicker_and_quicker.html</link>        
+               <guid isPermaLink="true">../../../Debian_boots_quicker_and_quicker.html</guid>
+                <pubDate>Wed, 24 Jun 2009 21:40:00 +0200</pubDate>
+               <description>
+&lt;p&gt;I spent Monday and tuesday this week in London with a lot of the
+people involved in the boot system on Debian and Ubuntu, to see if we
+could find more ways to speed up the boot system.  This was an Ubuntu
+funded
+&lt;a href=&quot;https://wiki.ubuntu.com/FoundationsTeam/BootPerformance/DebianUbuntuSprint&quot;&gt;developer
+gathering&lt;/a&gt;. It was quite productive.  We also discussed the future
+of boot systems, and ways to handle the increasing number of boot
+issues introduced by the Linux kernel becoming more and more
+asynchronous and event base.  The Ubuntu approach using udev and
+upstart might be a good way forward.  Time will show.&lt;/p&gt;
+
+&lt;p&gt;Anyway, there are a few ways at the moment to speed up the boot
+process in Debian.  All of these should be applied to get a quick
+boot:&lt;/p&gt;
+
+&lt;ul&gt;
+
+&lt;li&gt;Use dash as /bin/sh.&lt;/li&gt;
+
+&lt;li&gt;Disable the init.d/hwclock*.sh scripts and make sure the hardware
+   clock is in UTC.&lt;/li&gt;
+
+&lt;li&gt;Install and activate the insserv package to enable
+   &lt;a href=&quot;http://wiki.debian.org/LSBInitScripts/DependencyBasedBoot&quot;&gt;dependency
+   based boot sequencing&lt;/a&gt;, and enable concurrent booting.&lt;/li&gt;
+
+&lt;/ul&gt;
+
+These points are based on the Google summer of code work done by
+&lt;a href=&quot;http://initscripts-ng.alioth.debian.org/soc2006-bootsystem/&quot;&gt;Carlos
+Villegas&lt;/a&gt;.
+
+&lt;p&gt;Support for makefile-style concurrency during boot was uploaded to
+unstable yesterday.  When we tested it, we were able to cut 6 seconds
+from the boot sequence.  It depend on very correct dependency
+declaration in all init.d scripts, so I expect us to find edge cases
+where the dependences in some scripts are slightly wrong when we start
+using this.&lt;/p&gt;
+
+&lt;p&gt;On our IRC channel for this effort, #pkg-sysvinit, a new idea was
+introduced by Raphael Geissert today, one that could affect the
+startup speed as well.  Instead of starting some scripts concurrently
+from rcS.d/ and another set of scripts from rc2.d/, it would be
+possible to run a of them in the same process.  A quick way to test
+this would be to enable insserv and run &#39;mv /etc/rc2.d/S* /etc/rcS.d/;
+insserv&#39;.  Will need to test if that work. :)&lt;/p&gt;
+</description>
+       </item>
+       
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