blob: 91f5a847f031c5ee2b2ca059ea080419540c5544 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
<!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>
<main>
<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>
</main>
</body>
</html>
|
