diff options
Diffstat (limited to 'public/posts/2024-08-25-01.html')
| -rw-r--r-- | public/posts/2024-08-25-01.html | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/public/posts/2024-08-25-01.html b/public/posts/2024-08-25-01.html new file mode 100644 index 0000000..4bd4371 --- /dev/null +++ b/public/posts/2024-08-25-01.html @@ -0,0 +1,117 @@ + +<!DOCTYPE html> +<html lang="en"> + +<head> + <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> + <meta name="description" content="Home for a73x" /> + <meta name="author" content="a73x" /> + <meta name="viewport" + content="user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, width=device-width" /> + <title>a73x</title> + <link rel="stylesheet" href="/static/styles.css"> + <link rel="stylesheet" href="/static/syntax.css"> +</head> + +<body> + <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> + + + + <li><a class="no-decorations" href="/ethos">ethos</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> + + + <footer> + <br /> + <hr /><br /> + <p>see something you disagree with? email: <a href="mailto:[email protected]">[email protected]</a></p> + </footer> +</body> + +</html> + |