查看 JVM 默認參數

-XX:+PrintFlagsFinal

可以獲取所有可設置參數及值

獲取 JVM 默認 Xss 大小

java -XX:+PrintFlagsFinal -version | grep ThreadStackSize
     intx CompilerThreadStackSize                   = 0                                   {pd product}
     intx ThreadStackSize                           = 1024                                {pd product}
     intx VMThreadStackSize                         = 1024                                {pd product}
java version "1.8.0_65"
Java(TM) SE Runtime Environment (build 1.8.0_65-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01, mixed mode)