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<header>Updated: 2017-06-12 00:32:40 CST +08</header>
<main>
<h1 id="golang-benchmark-reading-config-from-os-env-and-file">Golang Benchmark Reading Config from OS ENV and File</h1>
<h2 id="intro">Intro</h2>
<p>Compare reading config from a json file and os enviroment variable.</p>
<h2 id="conclusion">Conclusion</h2>
<p><strong><em>Cache your config by variable whatever you use OS ENV or json file</em></strong></p>
<p>Get OS ENV is 30 times faster than read json file.</p>
<p>Caching config by variable is 1000 times faster than OS ENV</p>
<p>Caching config by variable is 30000 times faster than reading json file</p>
<h2 id="example">Example</h2>
<pre><code class="language-go">package main
import (
"fmt"
"os"
"io/ioutil"
"encoding/json"
)
func main() {
os.Setenv("TESTENV", "abc")
fmt.Println(ReadConfigFromENV())
fmt.Println(ReadConfigFromENVWithCached())
fmt.Println(ReadConfigFromFile())
fmt.Println(ReadConfigFromFileWithCached())
}
func ReadConfigFromENV() string {
return os.Getenv("TESTENV")
}
var osenv string
func ReadConfigFromENVWithCached() string {
if osenv != "" {
return osenv
}
osenv = os.Getenv("TESTENV")
return osenv
}
func ReadConfigFromFile() string {
config := readFile()
return config["TESTENV"]
}
var filenv string
func ReadConfigFromFileWithCached() string {
if filenv != "" {
return filenv
}
config := readFile()
filenv = config["TESTENV"]
return filenv
}
func readFile() map[string]string {
data, _ := ioutil.ReadFile("config.json")
var config map[string]string
json.Unmarshal(data, &config)
return config
}
</code></pre>
<pre><code class="language-go">package main
import (
"os"
"testing"
)
func TestMain(m *testing.M) {
os.Setenv("TESTENV", "abc")
os.Exit(m.Run())
}
func Benchmark_ReadConfigFromENV(b *testing.B) {
for i := 0; i < b.N; i++ {
ReadConfigFromENV()
}
}
func Benchmark_ReadConfigFromENVWithCached(b *testing.B) {
for i := 0; i < b.N; i++ {
ReadConfigFromENVWithCached()
}
}
func Benchmark_ReadConfigFromFile(b *testing.B) {
for i := 0; i < b.N; i++ {
ReadConfigFromFile()
}
}
func Benchmark_ReadConfigFromFileWithCached(b *testing.B) {
for i := 0; i < b.N; i++ {
ReadConfigFromFileWithCached()
}
}
</code></pre>
<pre><code class="language-bash">$ go test -bench=.
Benchmark_ReadConfigFromENV-2 300000 3686 ns/op
Benchmark_ReadConfigFromENVWithCached-2 300000000 4.82 ns/op
Benchmark_ReadConfigFromFile-2 10000 107606 ns/op
Benchmark_ReadConfigFromFileWithCached-2 300000000 4.45 ns/op
PASS
ok github.com/dinos80152/golang-leetcode 6.126s
</code></pre>
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