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* Nix 0.16 release notes.

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Eelco Dolstra 2010-08-16 12:38:32 +00:00
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doc/manual/release-notes.xml
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<!--==================================================================-->
<section xml:id="ssec-relnotes-0.16"><title>Release 0.16 (August 16, 2010)</title>
<para>This release has the following improvements:</para>
<itemizedlist>
<listitem>
<para>The Nix expression evaluator is now much faster in most
cases: typically, <link
xlink:href="http://www.mail-archive.com/nix-dev@cs.uu.nl/msg04113.html">3
to 8 times compared to the old implementation</link>. It also
uses less memory. It no longer depends on the ATerm
library.</para>
</listitem>
<listitem>
<para>
Support for configurable parallelism inside builders. Build
scripts have always had the ability to perform multiple build
actions in parallel (for instance, by running <command>make -j
2</command>), but this was not desirable because the number of
actions to be performed in parallel was not configurable. Nix
now has an option <option>--cores
<replaceable>N</replaceable></option> as well as a configuration
setting <varname>build-cores =
<replaceable>N</replaceable></varname> that causes the
environment variable <envar>NIX_BUILD_CORES</envar> to be set to
<replaceable>N</replaceable> when the builder is invoked. The
builder can use this at its discretion to perform a parallel
build, e.g., by calling <command>make -j
<replaceable>N</replaceable></command>. In Nixpkgs, this can be
enabled on a per-package basis by setting
<varname>enableParallelBuilding</varname> to
<literal>true</literal>.
</para>
</listitem>
<listitem>
<para><command>nix-store -q</command> now supports XML output
through the <option>--xml</option> flag.</para>
</listitem>
<listitem>
<para>Several bug fixes.</para>
</listitem>
</itemizedlist>
</section>
<!--==================================================================-->
<section xml:id="ssec-relnotes-0.15"><title>Release 0.15 (March 17, 2010)</title>