go - 更改 golang 测试/基准时间单位结果

Question

目前，在对 golang 中的一个小函数进行 golang 基准测试时，我得到以下结果

go test -bench=.

输出:

BenchmarkBcrypt10-4     1000000000           0.08 ns/op
BenchmarkBcrypt15-4            1    2607594388 ns/op
BenchmarkBcrypt18-4            1    20472224268 ns/op
PASS

无论如何将时间单位从ns更改为milisecons或秒？

更新:

这是我的基准文件( bcrypt_test.go ):

package main

import "testing"

func BenchmarkBcrypt10(b *testing.B){
    HashPassword("my pass", 10)
}

func BenchmarkBcrypt15(b *testing.B){
    HashPassword("my pass", 15)
}


func BenchmarkBcrypt18(b *testing.B){
    HashPassword("my pass", 18)
}

和我的 main.go :

package main

import (
    "fmt"

    "golang.org/x/crypto/bcrypt"
)

func HashPassword(password string, cost int) (string, error) {
    bytes, err := bcrypt.GenerateFromPassword([]byte(password), cost)
    return string(bytes), err
}

func CheckPasswordHash(password, hash string) bool {
    err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
    return err == nil
}

func main() {
    password := "secret"
    hash, _ := HashPassword(password, 12) // ignore error for the sake of simplicity

    fmt.Println("Password:", password)
    fmt.Println("Hash:    ", hash)

    match := CheckPasswordHash(password, hash)
    fmt.Println("Match:   ", match)
}

Answer 1

我有一个完美的解决方案给你!
安装所需的 benchstat 工具:

go get golang.org/x/perf/cmd/benchstat
go install  golang.org/x/perf/cmd/benchstat

生成文件:

gather: ; time go test -bench=. | grep --line-buffered  ^Bench | tee -a /tmp/o
stats: ; benchstat /tmp/o

当然，您不需要使用makefile。如果您愿意，只需直接在 shell 中运行命令。

go test -bench=. >/tmp/o
benchstat /tmp/o

示例输出:

$ make gather stats 
time go test -bench=. | grep --line-buffered  ^Bench | tee -a /tmp/o
BenchmarkBcrypt2-6      1000000000           0.04578 ns/op
BenchmarkBcrypt4-6      1000000000           0.0007562 ns/op
BenchmarkBcrypt6-6      1000000000           0.002905 ns/op
BenchmarkBcrypt8-6      1000000000           0.01147 ns/op
BenchmarkBcrypt10-6     1000000000           0.04584 ns/op
BenchmarkBcrypt15-6            1    1462752100 ns/op
BenchmarkBcrypt18-6            1    11705497684 ns/op
time: Real 0m14.1s  User 0m14.1s  System 0m0.0s
benchstat /tmp/o
name        time/op
Bcrypt2-6   0.05ns ± 0%
Bcrypt4-6   0.00ns ± 1%
Bcrypt6-6   0.00ns ± 0%
Bcrypt8-6   0.01ns ± 0%
Bcrypt10-6  0.05ns ± 1%
Bcrypt18-6   11.7s ± 1%
Bcrypt15-6   1.46s ± 0%

修改后的测试文件:

package main

import "testing"

func BenchmarkBcrypt2(b *testing.B) { HashPassword("my pass", 2) }
func BenchmarkBcrypt4(b *testing.B) { HashPassword("my pass", 4) }
func BenchmarkBcrypt6(b *testing.B) { HashPassword("my pass", 6) }
func BenchmarkBcrypt8(b *testing.B) { HashPassword("my pass", 8) }
func BenchmarkBcrypt10(b *testing.B) { HashPassword("my pass", 10) }
func BenchmarkBcrypt15(b *testing.B) { HashPassword("my pass", 15) }
func BenchmarkBcrypt18(b *testing.B) { HashPassword("my pass", 18) }

一些有用的链接:

https://go.googlesource.com/proposal/+/master/design/14313-benchmark-format.md

https://cs.opensource.google/go/x/perf