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<!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:sans-serif;line-height:1.35rem;font-size:16px;margin:0 auto}hr{margin-block-start:1.5rem}h1,h2,h3{line-height:initial}h1{font-size:xx-large}footer{margin-block-start:2rem}cap{text-transform:capitalize}table{max-width:100%;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}ul.list li{padding:.2em 0}ul{line-height:1.4em}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;padding:0 1em;border:1px solid #dcdcdc}code{padding:0 3px;font-size:14px;border:0}pre code{line-height:1.3em}pre,code,pre *,code *{font-family:monospace}figure{margin-inline-start:0;margin-inline-end:0}figcaption{text-align:center}figcaption p{margin:.3em 0 0}img,video,audio{max-width:100%}header{display:flex;flex-direction:row;gap:3rem}nav{display:flex;gap:.75rem}nav.main{flex-grow:1}.pstatus-orange{background:gold}.pstatus-green{background:#9acd32}.pstatus-red{background:#cd5c5c}@media only screen and (max-width:600px){body{padding:15px}header{flex-direction:column;gap:1rem}a{word-wrap:break-word}}</style><header><nav class=main itemscope itemtype=http://schema.org/SiteNavigationElement role=toolbar><a href=/>Home</a>
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<a href=/index.xml target=_blank>RSS</a></nav></header><main role=main><article itemtype=http://schema.org/Article><h1 itemtype=headline>Golang profiling simplified</h1><p><cap>post</cap>, Mar 7, 2017 on <a href=https://mitjafelicijan.com>Mitja Felicijan's blog</a><div><p>Many posts have been written regarding profiling in Golang and I haven’t found
proper tutorial regarding this. Almost all of them are missing some part of
important information and it gets pretty frustrating when you have a deadline
and are not finding simple distilled solution.<p>Nevertheless, after searching and experimenting I have found a solution that
works 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
where this files are generated programmatically in your golang code as we will
see 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
executing long enough. Programs, that execute too quickly don’t produce pprof
file 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
ensure some sort of execution. Memory profiling can be done without such a
“complex” function. But CPU profiling needs it.<p>Both memory and CPU profiling examples are almost the same. Only parameters in
main function when calling profile.Start are different. When we set
profile.ProfilePath(“.”) we tell profiler to store pprof files in the same
folder 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
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:#00f>import</span> (
</span></span><span style=display:flex><span> <span style=color:#a31515>"fmt"</span>
</span></span><span style=display:flex><span> <span style=color:#a31515>"time"</span>
</span></span><span style=display:flex><span> <span style=color:#a31515>"github.com/pkg/profile"</span>
</span></span><span style=display:flex><span>)
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:#00f>func</span> dummy_benchmark() {
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> fmt.Println(<span style=color:#a31515>"first set ..."</span>)
</span></span><span style=display:flex><span> <span style=color:#00f>for</span> i := 0; i < 918231333; i++ {
</span></span><span style=display:flex><span> i *= 2
</span></span><span style=display:flex><span> i /= 2
</span></span><span style=display:flex><span> }
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> <-time.After(time.Second*3)
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> fmt.Println(<span style=color:#a31515>"sencond set ..."</span>)
</span></span><span style=display:flex><span> <span style=color:#00f>for</span> i := 0; i < 9182312232; i++ {
</span></span><span style=display:flex><span> i *= 2
</span></span><span style=display:flex><span> i /= 2
</span></span><span style=display:flex><span> }
</span></span><span style=display:flex><span>}
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:#00f>func</span> main() {
</span></span><span style=display:flex><span> <span style=color:#00f>defer</span> profile.Start(profile.MemProfile, profile.ProfilePath(<span style=color:#a31515>"."</span>), profile.NoShutdownHook).Stop()
</span></span><span style=display:flex><span> dummy_benchmark()
</span></span><span style=display:flex><span>}
</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
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:#00f>import</span> (
</span></span><span style=display:flex><span> <span style=color:#a31515>"fmt"</span>
</span></span><span style=display:flex><span> <span style=color:#a31515>"time"</span>
</span></span><span style=display:flex><span> <span style=color:#a31515>"github.com/pkg/profile"</span>
</span></span><span style=display:flex><span>)
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:#00f>func</span> dummy_benchmark() {
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> fmt.Println(<span style=color:#a31515>"first set ..."</span>)
</span></span><span style=display:flex><span> <span style=color:#00f>for</span> i := 0; i < 918231333; i++ {
</span></span><span style=display:flex><span> i *= 2
</span></span><span style=display:flex><span> i /= 2
</span></span><span style=display:flex><span> }
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> <-time.After(time.Second*3)
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span> fmt.Println(<span style=color:#a31515>"sencond set ..."</span>)
</span></span><span style=display:flex><span> <span style=color:#00f>for</span> i := 0; i < 9182312232; i++ {
</span></span><span style=display:flex><span> i *= 2
</span></span><span style=display:flex><span> i /= 2
</span></span><span style=display:flex><span> }
</span></span><span style=display:flex><span>}
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:#00f>func</span> main() {
</span></span><span style=display:flex><span> <span style=color:#00f>defer</span> profile.Start(profile.CPUProfile, profile.ProfilePath(<span style=color:#a31515>"."</span>), profile.NoShutdownHook).Stop()
</span></span><span style=display:flex><span> dummy_benchmark()
</span></span><span style=display:flex><span>}
</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>
</span></span><span style=display:flex><span>go build mem.go
</span></span><span style=display:flex><span>./mem
</span></span><span style=display:flex><span>go tool pprof -pdf ./mem mem.pprof > mem.pdf
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># cpu profiling</span>
</span></span><span style=display:flex><span>go build cpu.go
</span></span><span style=display:flex><span>./cpu
</span></span><span style=display:flex><span>go tool pprof -pdf ./cpu cpu.pprof > cpu.pdf
</span></span></code></pre><p>This will generate PDF document with visualized profile.<ul><li><a href=/posts/go-profiling/golang-profiling-mem.pdf>Memory PDF profile example</a><li><a href=/posts/go-profiling/golang-profiling-cpu.pdf>CPU PDF profile example</a></ul></div></article></main><section><hr><h2>Posts from blogs I follow around the net</h2><ul><li><a href=https://chotrin.org/writing/2023-10-29.html target=_blank rel=noopener>even more bike things.</a><div>I wrote about all sorts of biking and not-biking things in my life this week. — <a href=https://chotrin.org>chötrin's wiki.</a><li><a href="http://offbeatpursuit.com:80/blog/?id=25" target=_blank rel=noopener>A fix by any other name</a><div>tags:
i2c, plan9
Another month, another file system.
Well, if you can’t fix it in software, fix it in hardware (looking at
you, bme680, we’re not
done yet). The show mu… — <a href=http://offbeatpursuit.com:80/blog/>WLOG - blog</a><li><a href=https://mirzapandzo.com/next-image-url-parameter-is-valid-but-upstream-response-is-invalid target=_blank rel=noopener>Next/Image "url" parameter is valid but upstream response is invalid</a><div>Getting "url" parameter is valid but upstream response is invalid error with Next/Image on WSL2 — <a href=https://mirzapandzo.com/>Mirza Pandzo's Blog</a><li><a href=https://drewdevault.com/2023/10/13/Going-off-script.html target=_blank rel=noopener>Going off-script</a><div>There is a phenomenon in society which I find quite bizarre. Upon our entry to
this mortal coil, we are endowed with self-awareness, agency, and free will.
Each of th… — <a href=https://drewdevault.com>Drew DeVault's blog</a><li><a href=https://solar.lowtechmagazine.com/2023/10/thematic-book-series-how-to-downsize-a-transport-network/ target=_blank rel=noopener>Thematic Book Series: How to Downsize a Transport Network?</a><div>Image: Book cover. [How to downsize a transport network?](https://www.lulu.com/shop/kris-de-decker/how-to-downsize-a-transport-network/paperback/product-42n4p7.htm… — <a href=https://solar.lowtechmagazine.com/posts/>LOW←TECH MAGAZINE English</a><li><a href=https://neil.computer/notes/chart-of-accounts-for-startups-and-saas-companies/ target=_blank rel=noopener>Chart of Accounts for Startups and SaaS Companies</a><div>Accounting is fundamental to starting a business. You need to have a basic understanding of accounting principles and essential bookkeeping. I had to learn it. Ther… — <a href=https://neil.computer/>Neil Panchal</a><li><a href=https://journal.valeriansaliou.name/deploy-a-nomad-cluster-on-alpine-linux-with-vultr/ target=_blank rel=noopener>Deploy a Nomad Cluster on Alpine Linux with Vultr</a><div>After spending countless hours trying to understand how to deploy my apps on Kubernetes for the first time to host Mirage, an AI API service that I run, I ended up … — <a href=https://journal.valeriansaliou.name/>Valerian Saliou</a><li><a href=https://jcs.org/2023/10/25/wifi_da target=_blank rel=noopener>BlueSCSI Wi-Fi Desk Accessory 1.0 Released</a><div>BlueSCSI Wi-Fi Desk Accessory
1.0 has been released:
wifi_da-1.0.sit
(StuffIt 3 archive)
SHA256: ccfc9d27dd5da7412d10cef73b81119a1fec3848e4d1d88ff652a07ffdc6a69aSHA1:… — <a href=https://jcs.org/>joshua stein</a></ul><p><a href=https://git.sr.ht/~sircmpwn/openring>Generated with openring.</a></section><footer><hr><p><big><strong>Want to comment or have something to add?</strong></big><p>You can write me an email
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