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<div id="header">
<h1>JSON module performance comparison under Lua</h1>
<span id="author">Mark Pulford</span><br />
<span id="email"><tt><<a href="mailto:mark@kyne.com.au">mark@kyne.com.au</a>></tt></span><br />
<span id="revdate">January 22, 2012</span>
<div id="toc">
<div id="toctitle">Table of Contents</div>
<noscript><p><b>JavaScript must be enabled in your browser to display the table of contents.</b></p></noscript>
</div>
</div>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>This performance comparison aims to provide a guide of relative
performance between several fast and popular JSON modules.</p></div>
<div class="paragraph"><p>The examples used in this comparison were mostly sourced from the
<a href="http://json.org">JSON website</a> and
<a href="http://tools.ietf.org/html/rfc4627">RFC 4627</a>.</p></div>
<div class="paragraph"><p>Performance will vary widely between platforms and data sets. These
results should only be used as an approximation.</p></div>
</div>
</div>
<h2 id="_modules">1. Modules</h2>
<div class="sectionbody">
<div class="paragraph"><p>The following JSON modules for Lua were tested:</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
<a href="http://chiselapp.com/user/dhkolf/repository/dkjson/">DKJSON 2.1</a>
</dt>
<dd>
<div class="ulist"><ul>
<li>
<p>
Lua implementation with no dependencies on other libraries
</p>
</li>
<li>
<p>
Supports LPeg to improve decode performance
</p>
</li>
</ul></div>
</dd>
<dt class="hdlist1">
<a href="https://github.com/brimworks/lua-yajl">Lua YAJL 2.0</a>
</dt>
<dd>
<div class="ulist"><ul>
<li>
<p>
C wrapper for the YAJL library
</p>
</li>
</ul></div>
</dd>
<dt class="hdlist1">
<a href="http://www.kyne.com.au/%7Emark/software/lua-cjson.php">Lua CSJON 2.0.0</a>
</dt>
<dd>
<div class="ulist"><ul>
<li>
<p>
C implementation with no dependencies on other libraries
</p>
</li>
</ul></div>
</dd>
</dl></div>
</div>
<h2 id="_summary">2. Summary</h2>
<div class="sectionbody">
<div class="paragraph"><p>All modules were built and tested as follows:</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
DKJSON
</dt>
<dd>
<p>
Tested with/without LPeg 10.2.
</p>
</dd>
<dt class="hdlist1">
Lua YAJL
</dt>
<dd>
<p>
Tested with YAJL 2.0.4.
</p>
</dd>
<dt class="hdlist1">
Lua CJSON
</dt>
<dd>
<p>
Tested with Libc and internal floating point conversion
routines.
</p>
</dd>
</dl></div>
<div class="paragraph"><p>The following Lua implementations were used for this comparison:</p></div>
<div class="ulist"><ul>
<li>
<p>
<a href="http://www.lua.org">Lua 5.1.4</a> (<em>Lua</em>)
</p>
</li>
<li>
<p>
<a href="http://www.luajit.org">LuaJIT 2.0.0-beta9</a> (<em>JIT</em>)
</p>
</li>
</ul></div>
<div class="paragraph"><p>These results show the number of JSON operations per second sustained by
each module. All results have been normalised against the pure Lua
DKJSON implementation.</p></div>
<div class="literalblock">
<div class="title">Decoding performance</div>
<div class="content">
<pre><tt> | DKJSON | Lua YAJL | Lua CJSON
| No LPeg With LPeg | | Libc Internal
| Lua JIT Lua JIT | Lua JIT | Lua JIT Lua JIT
example1 | 1x 2x 2.6x 3.4x | 7.1x 10x | 14x 20x 14x 20x
example2 | 1x 2.2x 2.9x 4.4x | 6.7x 9.9x | 14x 22x 14x 22x
example3 | 1x 2.1x 3x 4.3x | 6.9x 9.3x | 14x 21x 15x 22x
example4 | 1x 2x 2.5x 3.7x | 7.3x 10x | 12x 19x 12x 20x
example5 | 1x 2.2x 3x 4.5x | 7.8x 11x | 16x 24x 16x 24x
numbers | 1x 2.2x 2.3x 4x | 4.6x 5.5x | 8.9x 10x 13x 17x
rfc-example1 | 1x 2.1x 2.8x 4.3x | 6.1x 8.1x | 13x 19x 14x 21x
rfc-example2 | 1x 2.1x 3.1x 4.2x | 7.1x 9.2x | 15x 21x 17x 24x
types | 1x 2.2x 2.6x 4.3x | 5.3x 7.4x | 12x 20x 13x 21x
-------------|-------------------------|------------|-----------------------
= Average => | 1x 2.1x 2.7x 4.1x | 6.5x 9x | 13x 20x 14x 21x</tt></pre>
</div></div>
<div class="literalblock">
<div class="title">Encoding performance</div>
<div class="content">
<pre><tt> | DKJSON | Lua YAJL | Lua CJSON
| No LPeg With LPeg | | Libc Internal
| Lua JIT Lua JIT | Lua JIT | Lua JIT Lua JIT
example1 | 1x 1.8x 0.97x 1.6x | 3.1x 5.2x | 23x 29x 23x 29x
example2 | 1x 2x 0.97x 1.7x | 2.6x 4.3x | 22x 28x 22x 28x
example3 | 1x 1.9x 0.98x 1.6x | 2.8x 4.3x | 13x 15x 16x 18x
example4 | 1x 1.7x 0.96x 1.3x | 3.9x 6.1x | 15x 19x 17x 21x
example5 | 1x 2x 0.98x 1.7x | 2.7x 4.5x | 20x 23x 20x 23x
numbers | 1x 2.3x 1x 2.2x | 1.3x 1.9x | 3.8x 4.1x 4.2x 4.6x
rfc-example1 | 1x 1.9x 0.97x 1.6x | 2.2x 3.2x | 8.5x 9.3x 11x 12x
rfc-example2 | 1x 1.9x 0.98x 1.6x | 2.6x 3.9x | 10x 11x 17x 19x
types | 1x 2.2x 0.97x 2x | 1.2x 1.9x | 11x 13x 12x 14x
-------------|-------------------------|------------|-----------------------
= Average => | 1x 1.9x 0.98x 1.7x | 2.5x 3.9x | 14x 17x 16x 19x</tt></pre>
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Last updated 2012-03-01 22:52:50 CST
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