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* Remove the --use-atime / --max-atime garbage collector flags. Many

Browse source 
(Linux) machines no longer maintain the atime because it's too
  expensive, and on the machines where --use-atime is useful (like the
  buildfarm), reading the atimes on the entire Nix store takes way too
  much time to make it practical.
This commit is contained in:
Eelco Dolstra 2009-11-20 17:12:38 +00:00
parent 997db91e07
commit 8824d60fe5
7 changed files with 11 additions and 203 deletions
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45
doc/manual/nix-store.xml
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@ -213,8 +213,6 @@ linkend="sec-nix-build"><command>nix-build</command></link> does.</para>
</group>
<arg><option>--max-freed</option> <replaceable>bytes</replaceable></arg>
<arg><option>--max-links</option> <replaceable>nrlinks</replaceable></arg>
<arg><option>--max-atime</option> <replaceable>atime</replaceable></arg>
<arg><option>--use-atime</option></arg>
</cmdsynopsis>
</refsection>
@ -292,42 +290,6 @@ options control what gets deleted and in what order:
</varlistentry>
<varlistentry><term><option>--max-atime</option> <replaceable>atime</replaceable></term>
<listitem><para>Only delete a store path if its last-accessed time
is less than <replaceable>atime</replaceable>. This allows you to
garbage-collect only packages that haven’t been used recently.
The time is expressed as the number of seconds in the Unix epoch,
i.e., since 1970-01-01 00:00:00 UTC. An easy way to convert to
this format is <literal>date +%s -d "<replaceable>date
specification</replaceable>"</literal>.</para>
<para>For directories, the last-accessed time is the highest
last-accessed time of any regular file in the directory (or in any
of its subdirectories). That is, the <literal>atime</literal>
field maintained by the filesystem is ignored for directories.
This is because operations such as rebuilding the
<command>locate</command> database tend to update the
<literal>atime</literal> values of all directories, so they’re not
a useful indicator of whether a package was recently used.</para>
<para>Note that <command>nix-store --optimise</command> reads all
regular files in the Nix store, and so causes all last-accessed
times to be set to the present time. This makes
<option>--max-atime</option> ineffective (for a while at
least).</para></listitem>
</varlistentry>
<varlistentry><term><option>--use-atime</option></term>
<listitem><para>Delete store paths in order of ascending
last-accessed time. This is useful in conjunction with the other
options to delete only the least recently used
packages.</para></listitem>
</varlistentry>
</variablelist>
</para>
@ -358,13 +320,6 @@ deleting `/nix/store/kq82idx6g0nyzsp2s14gfsc38npai7lf-cairo-1.0.4.tar.gz.drv'
</para>
<para>To delete unreachable paths not accessed in the last two months:
<screen>
$ nix-store --gc -v --max-atime $(date +%s -d "2 months ago")</screen>
</para>
<para>To delete at least 100 MiBs of unreachable paths:
<screen>