golang benchmark template caching

README.md

golang benchmark template caching

Output

> go test -bench=. -test.benchtime=20s
goos: darwin
goarch: amd64
BenchmarkCached-12       	20000000	      1173 ns/op	     400 B/op	      10 allocs/op
BenchmarkNotCached-12    	 5000000	      7955 ns/op	    2766 B/op	      52 allocs/op
PASS
ok  	_/golang-benchmark-template-caching	72.913s

benchmark_test.go

package main

import (
	"bytes"
	"testing"
	"text/template"
)

var cachedTemplate = template.Must(template.New("master").Parse(`
  <ol>
  {{range .}}
    <li>{{.}}</li>
  {{end}}
  </ol>
`))

func cached(data []string) {
	var buffer bytes.Buffer
	cachedTemplate.Execute(&buffer, data)
}

func notCached(data []string) {
	var tmpl = template.Must(template.New("master").Parse(`
  <ol>
  {{range .}}
    <li>{{.}}</li>
  {{end}}
  </ol>
`))
	var buffer bytes.Buffer
	tmpl.Execute(&buffer, data)
}

func BenchmarkCached(b *testing.B) {
	b.ReportAllocs()
	data := []string{"1", "2", "3"}
	for i := 0; i < b.N; i++ {
		cached(data)
	}
}

func BenchmarkNotCached(b *testing.B) {
	b.ReportAllocs()
	data := []string{"1", "2", "3"}
	for i := 0; i < b.N; i++ {
		notCached(data)
	}
}