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<!DOCTYPE html>
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<title>a73x</title>
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<h1>a73x</h1>
<sub>high effort, low reward</sub>
<nav class="nav">
<ul>
<li><a class="no-decorations" href="/">home</a></li>
<li><a class="no-decorations" href="/posts">posts</a></li>
</ul>
</nav>
<h1>Go Benchmarking</h1>
<nav>
<ul>
<li><a href="#cpuprofile">cpuprofile</a></li>
<li><a href="#memprofile">memprofile</a></li>
<li><a href="#pprof">pprof</a>
<ul>
<li><a href="#views">views</a></li>
</ul></li>
</ul>
</nav>
<p>The benchmark cycle:</p>
<ol>
<li>write a benchmark</li>
<li>run a benchmark</li>
<li>get a profile</li>
<li>optimise</li>
<li>run your tests</li>
<li>goto 2.</li>
</ol>
<h1 id="cpuprofile">cpuprofile</h1>
<pre tabindex="0" class="chroma"><code><span class="line"><span class="cl">go <span class="nb">test</span> -test<span class="o">=</span>XXX -bench <regex> -cpuprofile <file>
</span></span></code></pre>
<h1 id="memprofile">memprofile</h1>
<pre tabindex="0" class="chroma"><code><span class="line"><span class="cl">go <span class="nb">test</span> -test<span class="o">=</span>XXX -bench <regex> -memprofile <file> -benchmem
</span></span></code></pre>
<h1 id="pprof">pprof</h1>
<p><a href="https://github.com/google/pprof/blob/main/doc/README.md">pprof usage</a></p>
<pre tabindex="0" class="chroma"><code><span class="line"><span class="cl">go pprof -http<span class="o">=</span>:8080 profile.pb.gz
</span></span></code></pre>
<p>will show a web UI for analysing the profile.</p>
<h2 id="views">views</h2>
<ul>
<li>flame graph: <code>localhost:8080/ui/flamegraph</code>
<ul>
<li>shows percentage breakdown of how much resource each “call” made.</li>
<li>clicking a box will make it “100%” allowing for deep diving</li>
<li>right click “show source code” to view</li>
</ul></li>
<li>top: <code>localhost:8080/ui/top</code>
<ul>
<li>shows top functions
<ul>
<li><code>flat</code>: profile samples in this function</li>
<li><code>cum</code>: (cumulative) profile samples in this function and its callees</li>
</ul></li>
</ul></li>
<li>source: <code>localhost:8080/ui/source</code>
<ul>
<li>each source line is annotated with the time spent in that source line
<ul>
<li>the first number does not count time spent in functions called from the source line</li>
<li>the second number does</li>
</ul></li>
</ul></li>
</ul>
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<p>see something you disagree with? email: <a href="mailto:[email protected]">[email protected]</a></p>
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