Can Golang use multi-core CPU?

Can Golang use multi-core CPU?

Golang can use multi-core CPU. Go has natural support for multi-core programming, so under what circumstances should we use multi-core to accelerate the program?

Related recommendations: golang tutorial

Let’s look at the following program:

package main
import (
        "runtime"
        "fmt"
        "sync"
  "time"
)
//定义任务队列
var waitgroup sync.WaitGroup
func xtgxiso(num int) {
        for i:=1;i<=1000000000;i++{
    num = num+i
    num = num-i
    num = num*i
    num = num/i
  }
        waitgroup.Done() //任务完成，将任务队列中的任务数量-1，其实.Done就是.Add(-1)
}
func main() {
  //记录开始时间
  start := time.Now()
        //设置最大的可同时使用的CPU核数和实际cpu核数一致
        runtime.GOMAXPROCS(1)
        for i := 1; i <= 10; i++ {
                waitgroup.Add(1) //每创建一个goroutine，就把任务队列中任务的数量+1
                go xtgxiso(i)
        }
        waitgroup.Wait() //Wait()这里会发生阻塞，直到队列中所有的任务结束就会解除阻塞 //记录结束时间
  end :=  time.Now()
  //输出执行时间，单位为秒。
  fmt.Println(end.Sub(start).Seconds())
}

We can set it through “runtime.GOMAXPROCS(1)” Single-core or multi-core execution, the comparison results show that multi-core is obviously faster than single-core, so for the operation of the CPU, the acceleration effect of multi-core operation is very obvious.

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