闲来没事，便试着测试了下golang的锁的性能。代码如下：
package main
import (
"fmt"
"os"
"strconv"
"sync"
"time"
)
var lock sync.Mutex
var count = 1
func work() {
for {
lock.Lock()
count++
lock.Unlock()
}
}
func main() {
nthread := 1
if len(os.Args) > 1 {
nthread, _ = strconv.Atoi(os.Args[1])
}
for i := 0; i < nthread; i++ {
go work()
}
old := 0
last := time.Now()
for {
time.Sleep(time.Second)
lock.Lock()
k := count
lock.Unlock()
now := time.Now()
fmt.Println(int(float64(k-old) / (float64(now.UnixNano()-last.UnixNano()) / 1e9)))
old = k
last = now
}
}
测试结果：
| 竞争的协程数 | 每秒总的lock次数 |
|---|---|
| 1 | 5千万 |
| 2 | 2.8千万 |
| 4 | 9百万 |
| 10 | 6百万 |
| 100 | 5百万 |
| 1000 | 5百万 |
| 10000 | 5百万 |
| 100000 | 5百万 |
| 1000000 | 5百万 |
