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1<!doctype html><html lang=en-us><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><link href="data:image/x-icon;base64,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" rel=icon type=image/x-icon><title>Golang profiling simplified</title><meta name=description content="Many posts have been written regarding profiling in Golang and I haven’t foundproper tutorial regarding this."><link rel=alternate type=application/rss+xml title="Mitja Felicijan's posts" href=https://mitjafelicijan.com/index.xml><link rel=alternate type=application/rss+xml title="Mitja Felicijan's notes" href=https://mitjafelicijan.com/notes.xml><style>body{padding:1rem;max-width:760px;background:#fff;font-family:times new roman,Times,serif;line-height:1.35rem}hr{margin-block-start:1.5rem}h1,h2,h3{line-height:initial}footer{margin-block-start:3rem}table{max-width:100%;border-collapse:separate;border-spacing:2px;border:1px solid #000;border-left:1px solid #999;border-top:1px solid #999}blockquote{font-style:italic}table thead{background:#eee}td,th{border:1px solid #000;padding:4px;border-right:1px solid #999;border-bottom:1px solid #999;text-align:left}pre{text-wrap:nowrap;overflow-x:auto;margin-block-start:1.5rem;margin-block-end:1.5rem;padding:.5rem 0;border-top:1px solid #000;border-bottom:1px solid #000}pre code{line-height:1.3em}pre,code,pre *,code *{font-family:monospace;font-size:initial!important}img,video,audio{max-width:100%}header{display:flex;flex-direction:row;gap:3rem}nav{display:flex;gap:.75rem}.pstatus-orange{background:gold}.pstatus-green{background:#9acd32}.pstatus-red{background:#cd5c5c}@media only screen and (max-width:600px){header{flex-direction:column;gap:1rem}a{word-wrap:break-word}}</style><header><nav class=main><a href=/>Home</a>
2<a href=https://git.mitjafelicijan.com/ target=_blank>Git</a>
3<a href=https://files.mitjafelicijan.com/ target=_blank>Files</a>
4<a href=/mitjafelicijan.pgp.pub.txt target=_blank>PGP</a>
5<a href=/curriculum-vitae.html>CV</a>
6<a href=/index.xml target=_blank>RSS</a></nav></header><main><div><h1>Golang profiling simplified</h1><p>Mar 7, 2017<div><p>Many posts have been written regarding profiling in Golang and I haven’t found
7proper tutorial regarding this. Almost all of them are missing some part of
8important information and it gets pretty frustrating when you have a deadline
9and are not finding simple distilled solution.<p>Nevertheless, after searching and experimenting I have found a solution that
10works for me and probably should also for you.<h2 id=where-are-my-pprof-files>Where are my pprof files?</h2><p>By default pprof files are generated in /tmp/ folder. You can override folder
11where this files are generated programmatically in your golang code as we will
12see below in example.<h2 id=why-is-my-cpu-profile-empty>Why is my CPU profile empty?</h2><p>I have found out that sometimes CPU profile is empty because program was not
13executing long enough. Programs, that execute too quickly don’t produce pprof
14file in my cases. Well, file is generated but only contains 4KB of information.<h2 id=profiling>Profiling</h2><p>As you can see from examples we are executing dummy_benchmark functions to
15ensure some sort of execution. Memory profiling can be done without such a
16“complex” function. But CPU profiling needs it.<p>Both memory and CPU profiling examples are almost the same. Only parameters in
17main function when calling profile.Start are different. When we set
18profile.ProfilePath(“.”) we tell profiler to store pprof files in the same
19folder as our program.<h3 id=memory-profiling>Memory profiling</h3><pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:#00f>package</span> main
20</span></span><span style=display:flex><span>
21</span></span><span style=display:flex><span><span style=color:#00f>import</span> (
22</span></span><span style=display:flex><span> <span style=color:#a31515>&#34;fmt&#34;</span>
23</span></span><span style=display:flex><span> <span style=color:#a31515>&#34;time&#34;</span>
24</span></span><span style=display:flex><span> <span style=color:#a31515>&#34;github.com/pkg/profile&#34;</span>
25</span></span><span style=display:flex><span>)
26</span></span><span style=display:flex><span>
27</span></span><span style=display:flex><span><span style=color:#00f>func</span> dummy_benchmark() {
28</span></span><span style=display:flex><span>
29</span></span><span style=display:flex><span> fmt.Println(<span style=color:#a31515>&#34;first set ...&#34;</span>)
30</span></span><span style=display:flex><span> <span style=color:#00f>for</span> i := 0; i &lt; 918231333; i++ {
31</span></span><span style=display:flex><span> i *= 2
32</span></span><span style=display:flex><span> i /= 2
33</span></span><span style=display:flex><span> }
34</span></span><span style=display:flex><span>
35</span></span><span style=display:flex><span> &lt;-time.After(time.Second*3)
36</span></span><span style=display:flex><span>
37</span></span><span style=display:flex><span> fmt.Println(<span style=color:#a31515>&#34;sencond set ...&#34;</span>)
38</span></span><span style=display:flex><span> <span style=color:#00f>for</span> i := 0; i &lt; 9182312232; i++ {
39</span></span><span style=display:flex><span> i *= 2
40</span></span><span style=display:flex><span> i /= 2
41</span></span><span style=display:flex><span> }
42</span></span><span style=display:flex><span>}
43</span></span><span style=display:flex><span>
44</span></span><span style=display:flex><span><span style=color:#00f>func</span> main() {
45</span></span><span style=display:flex><span> <span style=color:#00f>defer</span> profile.Start(profile.MemProfile, profile.ProfilePath(<span style=color:#a31515>&#34;.&#34;</span>), profile.NoShutdownHook).Stop()
46</span></span><span style=display:flex><span> dummy_benchmark()
47</span></span><span style=display:flex><span>}
48</span></span></code></pre><h3 id=cpu-profiling>CPU profiling</h3><pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:#00f>package</span> main
49</span></span><span style=display:flex><span>
50</span></span><span style=display:flex><span><span style=color:#00f>import</span> (
51</span></span><span style=display:flex><span> <span style=color:#a31515>&#34;fmt&#34;</span>
52</span></span><span style=display:flex><span> <span style=color:#a31515>&#34;time&#34;</span>
53</span></span><span style=display:flex><span> <span style=color:#a31515>&#34;github.com/pkg/profile&#34;</span>
54</span></span><span style=display:flex><span>)
55</span></span><span style=display:flex><span>
56</span></span><span style=display:flex><span><span style=color:#00f>func</span> dummy_benchmark() {
57</span></span><span style=display:flex><span>
58</span></span><span style=display:flex><span> fmt.Println(<span style=color:#a31515>&#34;first set ...&#34;</span>)
59</span></span><span style=display:flex><span> <span style=color:#00f>for</span> i := 0; i &lt; 918231333; i++ {
60</span></span><span style=display:flex><span> i *= 2
61</span></span><span style=display:flex><span> i /= 2
62</span></span><span style=display:flex><span> }
63</span></span><span style=display:flex><span>
64</span></span><span style=display:flex><span> &lt;-time.After(time.Second*3)
65</span></span><span style=display:flex><span>
66</span></span><span style=display:flex><span> fmt.Println(<span style=color:#a31515>&#34;sencond set ...&#34;</span>)
67</span></span><span style=display:flex><span> <span style=color:#00f>for</span> i := 0; i &lt; 9182312232; i++ {
68</span></span><span style=display:flex><span> i *= 2
69</span></span><span style=display:flex><span> i /= 2
70</span></span><span style=display:flex><span> }
71</span></span><span style=display:flex><span>}
72</span></span><span style=display:flex><span>
73</span></span><span style=display:flex><span><span style=color:#00f>func</span> main() {
74</span></span><span style=display:flex><span> <span style=color:#00f>defer</span> profile.Start(profile.CPUProfile, profile.ProfilePath(<span style=color:#a31515>&#34;.&#34;</span>), profile.NoShutdownHook).Stop()
75</span></span><span style=display:flex><span> dummy_benchmark()
76</span></span><span style=display:flex><span>}
77</span></span></code></pre><h3 id=generating-profiling-reports>Generating profiling reports</h3><pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:green># memory profiling</span>
78</span></span><span style=display:flex><span>go build mem.go
79</span></span><span style=display:flex><span>./mem
80</span></span><span style=display:flex><span>go tool pprof -pdf ./mem mem.pprof &gt; mem.pdf
81</span></span><span style=display:flex><span>
82</span></span><span style=display:flex><span><span style=color:green># cpu profiling</span>
83</span></span><span style=display:flex><span>go build cpu.go
84</span></span><span style=display:flex><span>./cpu
85</span></span><span style=display:flex><span>go tool pprof -pdf ./cpu cpu.pprof &gt; cpu.pdf
86</span></span></code></pre><p>This will generate PDF document with visualized profile.<ul><li><a href=/assets/go-profiling/golang-profiling-mem.pdf>Memory PDF profile example</a><li><a href=/assets/go-profiling/golang-profiling-cpu.pdf>CPU PDF profile example</a></ul></div></div></main><footer><hr><div><h3>Want to comment or have something to add?</h3>You can write me an email at
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