[go语言]Buffered channel、slice和mutex的简单性能测试

stevewang · · 2880 次点击 · · 开始浏览

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测试代码：


package main
import (
    "fmt"
    "runtime"
    "sync"
    "time"
)
const COUNT = 1000000
func bench1(ch chan int) time.Duration {
    t := time.Now()
    for i := 0; i < COUNT; i++ {
        ch <- i
    }
    var v int
    for i := 0; i < COUNT; i++ {
        v = <-ch
    }
    _ = v
    return time.Now().Sub(t)
}
func bench2(s []int) time.Duration {
    t := time.Now()
    for i := 0; i < COUNT; i++ {
        s[i] = i
    }
    var v int
    for i := 0; i < COUNT; i++ {
        v = s[i]
    }
    _ = v
    return time.Now().Sub(t)
}
func bench3(s []int, mutex *sync.Mutex) time.Duration {
    t := time.Now()
    for i := 0; i < COUNT; i++ {
        mutex.Lock()
        s[i] = i
        mutex.Unlock()
    }
    var v int
    for i := 0; i < COUNT; i++ {
        mutex.Lock()
        v = s[i]
        mutex.Unlock()
    }
    _ = v
    return time.Now().Sub(t)
}
func main() {
    runtime.GOMAXPROCS(runtime.NumCPU())
    ch := make(chan int, COUNT)
    s := make([]int, COUNT)
    var mutex sync.Mutex
    fmt.Println("channel\tslice\tmutex_slice")
    for i := 0; i < 10; i++ {
        fmt.Printf("%v\t%v\t%v\n", bench1(ch), bench2(s), bench3(s, &mutex))
    }
}

测试环境

CPU: i7-3770

MEMORY: 32G

OS: ubuntu12.04 x86_64

GO VERSION: 1.0.3

输出：

channel	slice	mutex_slice
53.774ms	1.735ms	37.103ms
52.978ms	1.058ms	36.928ms
52.864ms	1.058ms	36.928ms
53.337ms	1.069ms	38.073ms
53.695ms	1.055ms	37.801ms
53.45ms	1.063ms	37.683ms
53.678ms	1.161ms	37.767ms
3.568ms	1.052ms	37.792ms
53.47ms	1.06ms	37.185ms
52.78ms	1.062ms	36.899ms