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[homepage.git] / blog / archive / 2016 / 11 / index.html

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@@ -21,6 +21,65 @@
 
     <h3>Entries from November 2016.</h3>
     
+    <div class="entry">
+      <div class="title">
+        <a href="http://people.skolelinux.org/pere/blog/Quicker_Debian_installations_using_eatmydata.html">Quicker Debian installations using eatmydata</a>
+      </div>
+      <div class="date">
+        25th November 2016
+      </div>
+      <div class="body">
+        <p>Two years ago, I did some experiments with eatmydata and the Debian
+installation system, observing how using
+<a href="http://people.skolelinux.org/pere/blog/Speeding_up_the_Debian_installer_using_eatmydata_and_dpkg_divert.html">eatmydata
+could speed up the installation</a> quite a bit.  My testing measured
+speedup around 20-40 percent for Debian Edu, where we install around
+1000 packages from within the installer.  The eatmydata package
+provide a way to disable/delay file system flushing.  This is a bit
+risky in the general case, as files that should be stored on disk will
+stay only in memory a bit longer than expected, causing problems if a
+machine crashes at an inconvenient time.  But for an installation, if
+the machine crashes during installation the process is normally
+restarted, and avoiding disk operations as much as possible to speed
+up the process make perfect sense.
+
+<p>I added code in the Debian Edu specific installation code to enable
+<a href="https://tracker.debian.org/pkg/libeatmydata">eatmydata</a>,
+but did not have time to push it any further.  But a few months ago I
+picked it up again and worked with the libeatmydata package maintainer
+Mattia Rizzolo to make it easier for everyone to get this installation
+speedup in Debian.  Thanks to our cooperation There is now an
+eatmydata-udeb package in Debian testing and unstable, and simply
+enabling/installing it in debian-installer (d-i) is enough to get the
+quicker installations.  It can be enabled using preseeding.  The
+following untested kernel argument should do the trick:</p>
+
+<blockquote><pre>
+preseed/early_command="anna-install eatmydata-udeb"
+</pre></blockquote>
+
+<p>This should ask d-i to install the package inside the d-i
+environment early in the installation sequence.  Having it installed
+in d-i in turn will make sure the relevant scripts are called just
+after debootstrap filled /target/ with the freshly installed Debian
+system to configure apt to run dpkg with eatmydata.  This is enough to
+speed up the installation process.  There is a proposal to
+<a href="https://bugs.debian.org/841153">extend the idea a bit further
+by using /etc/ld.so.preload instead of apt.conf</a>, but I have not
+tested its impact.</p>
+
+
+      </div>
+      <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>
+    </div>
+    <div class="padding"></div>
+    
     <div class="entry">
       <div class="title">
         <a href="http://people.skolelinux.org/pere/blog/Oversette_bokm_l_til_nynorsk__enklere_enn_du_tror_takket_v_re_Apertium.html">Oversette bokmål til nynorsk, enklere enn du tror takket være Apertium</a>
@@ -618,7 +677,7 @@ dele sine personopplysninger med leverandøren.</p>
 
 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
 
-<li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (6)</a></li>
+<li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (7)</a></li>
 
 </ul></li>
 
@@ -857,9 +916,9 @@ dele sine personopplysninger med leverandøren.</p>
 
  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 
- <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (140)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (141)</a></li>
 
- <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (157)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
 
  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
 
@@ -869,7 +928,7 @@ dele sine personopplysninger med leverandøren.</p>
 
  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 
- <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (332)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (333)</a></li>
 
  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>