func BenchmarkStringf(b *testing.B) {
b.ResetTimer()
for i := 0; i < b.N; i++ {
var str string
for j := 0; j < numbers; j++ {
str = fmt.Sprintf("%s%d", str, j)
}
}
b.StopTimer()
}
func BenchmarkStringAdd(b *testing.B) {
b.ResetTimer()
for i := 0; i < b.N; i++ {
var str string
for j := 0; j < numbers; j++ {
str = str + strconv.Itoa(j)
}
}
b.StopTimer()
}
func BenchmarkStringBuilder(b *testing.B) {
b.ResetTimer()
for i := 0; i < b.N; i++ {
var builder strings.Builder
for j := 0; j < numbers; j++ {
builder.WriteString(strconv.Itoa(j))
}
_ = builder.String()
}
b.StopTimer()
}
测试数据如下
使用fmt.Sprintf
使用字符串相加str = str + strconv.Itoa(j)
使用strings.Builder
命令行运行所有benchmark
➜ ch11 go test -bench='.*'
6666666
goos: linux
goarch: amd64
pkg: awesomeProject/ch11
cpu: AMD Ryzen 5 5600G with Radeon Graphics
BenchmarkAdd-12 1000000000 0.2320 ns/op
BenchmarkStringf-12 49 22959820 ns/op
BenchmarkStringAdd-12 61 22481787 ns/op
BenchmarkStringBuilder-12 5703 211218 ns/op
PASS
ok awesomeProject/ch11 4.026s
总结
使用strings.Builder速度最快
标签：12,++,testing,Benchmark,拼接,str,字符串,ns,op From： https://www.cnblogs.com/postkarte/p/17788392.html