性能测试之数字转字符串

Golang 数字转字符串性能对比

测试平台: M1 Macbook Pro
golang版本: 1.18.3

测试代码

package number_string_conversion

import (
	"fmt"
	"strconv"
	"testing"
)

const (
	Int   = 123456789
	Float = 1.23456789
)

func BenchmarkForUseFmtInt(b *testing.B) {
	for i := 0; i < b.N; i++ {
		j := fmt.Sprint(Int)
		_ = j
	}
}

func BenchmarkForUseStrconvInt(b *testing.B) {
	for i := 0; i < b.N; i++ {
		j := strconv.Itoa(Int)
		_ = j
	}
}

func BenchmarkForUseFmtFloat(b *testing.B) {
	for i := 0; i < b.N; i++ {
		f := fmt.Sprintf("%.3f", Float)
		_ = f
	}
}

func BenchmarkForUseStrconvFloat(b *testing.B) {
	for i := 0; i < b.N; i++ {
		f := strconv.FormatFloat(Float, 'f', 3, 64)
		_ = f
	}
}

测试结果

go test -bench=. -benchmem -run=none

goos: darwin
goarch: arm64
pkg: golang_benchmark/number_string_conversion
BenchmarkForUseFmtInt-8                 26354566                45.43 ns/op           16 B/op          1 allocs/op
BenchmarkForUseStrconvInt-8             56409640                21.40 ns/op           16 B/op          1 allocs/op
BenchmarkForUseFmtFloat-8                5879715                194.7 ns/op            5 B/op          1 allocs/op
BenchmarkForUseStrconvFloat-8            6860202                174.6 ns/op           29 B/op          2 allocs/op
PASS
ok      golang_benchmark/number_string_conversion       6.340s

测试结论

strconv包的性能明显优于fmt包

上篇性能测试之字符串拼接