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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?
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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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