package mainimport ("fmt""time"
)func testNum(num int) {for i := 1; i <= 10000000; i++{num = num + inum = num - inum = num * inum = num / i}
}func main() {start := time.Now()for i := 1; i <= 10; i++ {testNum(1)}end :=  time.Now()fmt.Println(end.Sub(start).Seconds())
}

package mainimport ("fmt""time""sync"
)var synWait sync.WaitGroupfunc testNum(num int) {for i := 1; i <= 10000000; i++{num = num + inum = num - inum = num * inum = num / i}synWait.Done()    // 相当于 synWait.Add(-1)
}func main() {start := time.Now()for i := 1; i <= 10; i++ {synWait.Add(1)go testNum(1)}synWait.Wait()end :=  time.Now()fmt.Println(end.Sub(start).Seconds())
}

package mainimport ("fmt""time""sync"
)var synWait sync.WaitGroup
var normalMap map[int]int
var synMutex sync.Mutexfunc testNum(num int) {for i := 1; i <= 10000000; i++{synMutex.Lock()normalMap[i] = num　　　　// testslic = append(testslic, num) 这里slice也是一样的道理synMutex.Unlock()}synWait.Done()   // 相当于 synWait.Add(-1)
}func main() {normalMap = make(map[int]int)start := time.Now()for i := 1; i <= 10; i++ {synWait.Add(1)testNum(1)       // 单协程操作//go testNum(1)     // 多协程并发操作}synWait.Wait()end :=  time.Now()fmt.Println(end.Sub(start).Seconds())
}

package mainimport ("fmt""time""sync"
)var synWait sync.WaitGroup
var normalMap map[int]intfunc testNum(data chan int, num int) {for i:=1;i<=10000000;i++{data <- i}synWait.Done()
}func main() {normalMap = make(map[int]int)data := make(chan int)start := time.Now()go concurrent(data)for i := 1; i <= 10; i++ {synWait.Add(1)go testNum(data,1)     // 多协程并发操作}synWait.Wait()end :=  time.Now()fmt.Println(end.Sub(start).Seconds())
}func concurrent(data chan int)  {for {i := <- datanormalMap[i] = i}
}