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<div class="section" id="optimization">
<span id="id1"></span><h1>Optimization<a class="headerlink" href="#optimization" title="Permalink to this headline">¶</a></h1>
<p>If you're feeling your Buildbot is running a bit slow, here are some tricks that may help you,
but use them at your own risk.</p>
<div class="section" id="properties-load-speedup">
<h2>Properties load speedup<a class="headerlink" href="#properties-load-speedup" title="Permalink to this headline">¶</a></h2>
<p>For example, if most of your build properties are strings, you can gain an approx. 30% speedup
if you put this snippet of code inside your master.cfg file:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">def</span> <span class="nf">speedup_json_loads</span><span class="p">():</span>
<span class="kn">import</span> <span class="nn">json</span><span class="o">,</span> <span class="nn">re</span>
<span class="n">original_decode</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">_default_decoder</span><span class="o">.</span><span class="n">decode</span>
<span class="n">my_regexp</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="s">r'^\[\"([^"]*)\",\s+\"([^"]*)\"\]$'</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">decode_with_re</span><span class="p">(</span><span class="nb">str</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kw</span><span class="p">):</span>
<span class="n">m</span> <span class="o">=</span> <span class="n">my_regexp</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="nb">str</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">list</span><span class="p">(</span><span class="n">m</span><span class="o">.</span><span class="n">groups</span><span class="p">())</span>
<span class="k">except</span><span class="p">:</span>
<span class="k">return</span> <span class="n">original_decode</span><span class="p">(</span><span class="nb">str</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kw</span><span class="p">)</span>
<span class="n">json</span><span class="o">.</span><span class="n">_default_decoder</span><span class="o">.</span><span class="n">decode</span> <span class="o">=</span> <span class="n">decode_with_re</span>
<span class="n">speedup_json_loads</span><span class="p">()</span>
</pre></div>
</div>
<p>It patches json decoder so that it would first try to extract a value from JSON that is a list
of two strings (which is the case for a property being a string), and would fallback to general
JSON decoder on any error</p>
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