java面试-JVM调优和参数配置

JVM的参数类型：

1、标配参数：

java -version  
java -help

2、X参数：

-Xmixed 混合模式

-Xint  解释执行

-Xcomp 第一次使用就编译成本地代码

wujuhongdeMacBook-Pro:~ wujuhong$ java -version 
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)
wujuhongdeMacBook-Pro:~ wujuhong$ java -Xint -version
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, interpreted mode)
wujuhongdeMacBook-Pro:~ wujuhong$ java -Xcomp -version
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, compiled mode)
wujuhongdeMacBook-Pro:~ wujuhong$ 

XX参数：

如何查看JVM系统参数的默认值