【Duke】BenchMark 034 - PingPongGooo/GoFoundation GitHub Wiki

Benchmark 代码性能的测评

func BenchmarkConcatStringByAdd(b *testing.B){
   // 与性能测试无关的代码
   b.ResetTimer()
   for i:=0; i<b.N; i++{
     // 测试代码
   }
   b.StopTimer()
   // 与性能测试无关的代码
}

package benchmark

import (
	"bytes"
	assert2 "github.com/stretchr/testify/assert"
	"testing"
)

func TestConcatStringByAdd(t *testing.T){
	assert:=assert2.New(t)
	elems:=[]string{"1","2","3","4","5"}
	ret := ""
	for _,elem := range elems{
		ret += elem
	}
	assert.Equal("12345",ret)
}

func TestConcatStringByBytesBuffer(t *testing.T)  {
	assert := assert2.New(t)
	var buf bytes.Buffer
	elems := []string{"1","2","3","4","5"}
	for _,elem := range elems{
		buf.WriteString(elem)
	}
	assert.Equal("12345",buf.String())
}


func BenchmarkConcatStringByAdd(b *testing.B){
	elems:=[]string{"1","2","3","4","5"}
	b.ResetTimer()
	for i := 0; i<b.N;i++  {
		ret := ""
		for _,elem := range elems{
			ret += elem
		}
	}
	b.StopTimer()
}

func BenchmarkConcatStringByBytesBuffer(b *testing.B)  {
	elems := []string{"1","2","3","4","5"}
	b.ResetTimer()

	for i := 0; i<b.N;i++  {
		var buf bytes.Buffer
		for _,elem := range elems{
			buf.WriteString(elem)
		}
	}
	b.StopTimer()
}

D:\Develop\GoWork\src\GoFoundation\go_learn\ch35\benchmark>go test -bench=.
goos: windows
goarch: amd64
pkg: GoFoundation/go_learn/ch35/benchmark
BenchmarkConcatStringByAdd-8             7162570               182 ns/op
BenchmarkConcatStringByBytesBuffer-8    13437127                84.0 ns/op
PASS
ok      GoFoundation/go_learn/ch35/benchmark    3.297s

D:\Develop\GoWork\src\GoFoundation\go_learn\ch35\benchmark>go test -bench=. -benchmem
goos: windows
goarch: amd64
pkg: GoFoundation/go_learn/ch35/benchmark
BenchmarkConcatStringByAdd-8             6537823               191 ns/op              16 B/op          4 allocs/op
BenchmarkConcatStringByBytesBuffer-8    14407370                86.0 ns/op            64 B/op          1 allocs/op
PASS
ok      GoFoundation/go_learn/ch35/benchmark    3.243s

Benchmark

go test -bench=. -benchmem

-bench=<相关benchmark测试>
Windows下使用go test命令行时， -bench=.应写为 -bench="."