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<h1 class="page-title">Tutorial: performance-testing</h1>
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<h2>performance-testing</h2>
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<h1>Performance testing</h1>
<p>Shields has some basic tooling available to help you get started with
performance testing.</p>
<h2>Benchmarking the badge generation</h2>
<p>Want to micro-benchmark a section of the code responsible for generating the
static badges? Follow these two simple steps:</p>
<ol>
<li>Surround the code you want to time with <code>console.time</code> and <code>console.timeEnd</code>
statements. For example:</li>
</ol>
<pre class="prettyprint source"><code>console.time('makeBadge')
const svg = makeBadge(badgeData)
console.timeEnd('makeBadge')
</code></pre>
<ol start="2">
<li>Run <code>npm run benchmark:badge</code> in your terminal. An average timing will
be displayed!</li>
</ol>
<p>If you want to change the number of iterations in the benchmark, you can modify
the values specified by the <code>benchmark:badge</code> script in <em>package.json</em>. If
you want to benchmark a specific code path not covered by the static badge, you
can modify the badge URL in <em>scripts/benchmark-performance.js</em>.</p>
<h2>Profiling the full code</h2>
<p>Want to have an overview of how the entire application is performing? Simply
run <code>npm run profile:server</code> in your terminal. This will start the
backend server (i.e. without the frontend) in profiling mode and any requests
you make on <code>localhost:8080</code> will generate data in a file with a name
similar to <em>isolate-00000244AB6ED3B0-11920-v8.log</em>.</p>
<p>You can then make use of this profiling data in various tools, for example
<a href="https://github.com/mapbox/flamebearer">flamebearer</a>:</p>
<pre class="prettyprint source"><code>npm install -g flamebearer
node --prof-process --preprocess -j isolate-00000244AB6ED3B0-11920-v8.log | flamebearer
</code></pre>
<p>An example output is the following:
<img src="https://raw.github.com/badges/shields/master/doc/flamegraph.png" alt=""></p>
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