Hotspot JVM 1.8 参数查阅手册

这里整理下 JVM 相关的参数信息，本文档使用的是 MAC OS 平台的 Hotspot JVM，版本为 1.8.0_181。

JVM 运行模式

Hotspot JVM 有两种运行模式，分别是 server 和 client。
它们的区别是 server 的初始堆空间会大一些，默认使用的是并行垃圾回收器，启动慢运行快。client VM 相对来讲会保守一些，初始堆空间会小一些，使用串行的垃圾回收器，它的目标是为了让 JVM 的启动速度更快，但运行速度会比 server 模式慢些。
可以使用-server 和-client 选项来指定 JVM 的类型。

X 选项

java -X 可以输出所以的 X 的选项，下面列出一些常用的选项。

-Xmixed           混合模式执行 (默认)
-Xint             仅解释模式执行
-Xloggc:<file>    将 GC 状态记录在文件中 (带时间戳)
-Xms<size>        设置初始 Java 堆大小
-Xmx<size>        设置最大 Java 堆大小
-Xss<size>        设置 Java 线程堆栈大小

XX 选项

查看所有 XX 选项的执行语句为：java -XX:+PrintFlagsInitial，对应的配置语法如下：

• 如果是布尔类型的选项，它的格式为-XX:+flag 或者-XX:-flag,分别表示开启和关闭选项。
• 针对非布尔类型的选项，它的格式为-XX:flag=value

说明部分是从互联网上搜集到的相关的定义，我整理的差不多的时候才知道，源码里有你想要的一切：
http://hg.openjdk.java.net/jdk8/jdk8/hotspot/file/tip/src/share/vm/runtime/globals.hpp

查看 JVM 自动设置的 XX 配置

查看 JVM 自动设置的 XX 配置的命令：java -XX:+PrintCommandLineFlags,输出如下：

-XX:InitialHeapSize=268435456 -XX:MaxHeapSize=4294967296 -XX:+PrintCommandLineFlags -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseParallelGC

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