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                            ## MetaSpace本地元空間
JDK8將原來存放Klass元數據的Perm換成了元空間MetaSpace
JDK8中MetaSpace分為Klass MetaSpace和NoKlass MetaSpace

### JVM參數
* MetaspaceSize：表示觸發Metaspace區域GC閾值(在Linux下JDK8默認大小為20.79M)；
* MaxMetaspaceSize：表示Metaspace最大值(在Linux下JDK8默認大小為18446744073709547520M，可以認為是無限大)

MetaSpace大小= Klass MetaSpace大小 + NoKlass MetaSpace大小，Klass MetaSpace大小由CompressedClassSpaceSize指定；NoKlass MetaSpace大小則為2 * InitialBootClassLoaderMetaspaceSize，即默認情況下MetaSpace大小= 1024M + 4M * 2 = 1032M
元數據區并沒有使用虛擬機的內存，而是直接使用操作系統的本地內存。因此，元空間的大小不受JVM內存的限制，只和操作系統的內存有關

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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