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                            ## JVM編譯執行模式
JVM存在三種代碼編譯執行模式：
* 解釋模式
* 編譯模式
* 混合模式

### 解釋執行
該模式下全部代碼都是解釋執行，不做任何JIT編譯；

### 編譯執行
純編譯執行模式，所有方法在第一次調用時就會編譯成機器碼；該模式會導致系統啟動時間大幅增加；

### 分層編譯
JDK8后分層編譯默認開啟
![](https://img.kancloud.cn/90/ad/90ade85ce3e88a91bd9dc664132d8188_690x219.png)

*****
【參考資料】
### 美團 [Java即時編譯器原理解析及實踐](https://tech.meituan.com/2020/10/22/java-jit-practice-in-meituan.html)
[https://segmentfault.com/a/1190000037465424](https://segmentfault.com/a/1190000037465424)
[https://tech.meituan.com/2020/10/22/java-jit-practice-in-meituan.html](https://tech.meituan.com/2020/10/22/java-jit-practice-in-meituan.html)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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