GoLang Channel与mutex的选择，性能差不多

来源：互联网发布：红警3单位数据编辑：程序博客网时间：2024/06/04 14:58

go官方应该是更推荐使用chan
https://github.com/golang/go/wiki/MutexOrChannel

以下代码用于测试性能 — 不确保思路是正确的。

package mainimport (    "fmt"    "sync"    "time")type Op struct {    key int    val int}var lock sync.Mutexvar m1 map[int]intvar m2 map[int]intvar max int = 50000func update_map_by_mutex(i int) {    lock.Lock()    m1[i] = i    if len(m1) == max {        fmt.Printf("%s mutex finish\n", time.Now())    }    lock.Unlock()}var ch chan Opfunc update_map_by_chan(i int) {    ch <- Op{key: i, val: i}}func wait_for_chan(m map[int]int) {    for {        select {        case op := <-ch:            m[op.key] = op.val            if len(m2) == max {                fmt.Printf("%s chan finish\n", time.Now())                return            }        }    }}func main() {    m1 = make(map[int]int, max)    m2 = make(map[int]int, max)    ch = make(chan Op)    go wait_for_chan(m2)    for i := 0; i < max; i++ {        go update_map_by_chan(i)        go update_map_by_mutex(i)    }    time.Sleep(time.Second * 1)}

输出结果：

2015-11-17 17:08:18.06992 +0800 CST mutex finish
2015-11-17 17:08:18.0709215 +0800 CST chan finish

mutex性能略好，但chan更go化，更推荐。

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