55 lines
1.9 KiB
XML
55 lines
1.9 KiB
XML
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<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0"
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xml:id="ssec-relnotes-0.16">
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<title>Release 0.16 (August 17, 2010)</title>
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<para>This release has the following improvements:</para>
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<itemizedlist>
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<listitem>
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<para>The Nix expression evaluator is now much faster in most
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cases: typically, <link
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xlink:href="http://www.mail-archive.com/nix-dev@cs.uu.nl/msg04113.html">3
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to 8 times compared to the old implementation</link>. It also
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uses less memory. It no longer depends on the ATerm
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library.</para>
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</listitem>
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<listitem>
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<para>
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Support for configurable parallelism inside builders. Build
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scripts have always had the ability to perform multiple build
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actions in parallel (for instance, by running <command>make -j
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2</command>), but this was not desirable because the number of
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actions to be performed in parallel was not configurable. Nix
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now has an option <option>--cores
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<replaceable>N</replaceable></option> as well as a configuration
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setting <varname>build-cores =
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<replaceable>N</replaceable></varname> that causes the
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environment variable <envar>NIX_BUILD_CORES</envar> to be set to
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<replaceable>N</replaceable> when the builder is invoked. The
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builder can use this at its discretion to perform a parallel
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build, e.g., by calling <command>make -j
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<replaceable>N</replaceable></command>. In Nixpkgs, this can be
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enabled on a per-package basis by setting the derivation
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attribute <varname>enableParallelBuilding</varname> to
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<literal>true</literal>.
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</para>
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</listitem>
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<listitem>
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<para><command>nix-store -q</command> now supports XML output
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through the <option>--xml</option> flag.</para>
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</listitem>
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<listitem>
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<para>Several bug fixes.</para>
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</listitem>
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</itemizedlist>
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</chapter>
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