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                            [TOC]
>[success] ## **一：runtime包基本介紹**


runtime包提供和go運行時環境的互操作，如控制go程的函數。它也包括用于reflect包的低層次類型信息；參見reflect報的文檔獲取運行時類型系統的可編程接口。

<br>

>[success] ## **二：rumtime.NumCPU（）** 

可以獲取當前操作系統CPU的數量（是邏輯CPU不一定是真實的CPU）
![](https://img.kancloud.cn/7e/39/7e39ef3a4964259dd34008e41458319d_1236x648.png)

<br>

>[success] ## **三：runtime.GOMAXPROCS()**

![](https://img.kancloud.cn/dd/6b/dd6b967c5d265f812f0449059215dd4e_975x273.png)


**注意：**

1）Go1.8后，默認讓程序運行在多核上，可以不用設置了

2）Go1.8前，還是要手動設置，可以更高效的利益CPU

<br>

**代碼示例如下：**

![](https://img.kancloud.cn/e7/bc/e7bc3c4f29188fd8d6b6db2a30760ce4_1209x484.png)


<br>

**運行結果**

![](https://img.kancloud.cn/f7/1c/f71ce835ec26ed8980241011dce089d4_1209x229.png)


















                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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