重复的Java运行时选项：首选顺序是什么？ [英] Duplicated Java runtime options : what is the order of preference?

问题描述

考虑以下命令行

java -Xms128m -Xms256m myapp.jar

哪些设置适用于JVM最小内存（ Xms 选项）：128m或256m？

Which settings will apply for JVM Minimum memory (Xms option) : 128m or 256m ?

推荐答案

取决于JVM，可能是版本......甚至可能是你当时桌面上有多少纸夹。它可能甚至不起作用。不要这样做。

Depends on the JVM, perhaps the version...perhaps even how many paper clips you have on your desk at the time. It might not even work. Don't do that.

如果由于某种原因它不在您的控制范围内，请按照运行jar的方式编译和运行它。但要注意，依赖选项的顺序是一个非常糟糕的主意。

If it's out of your control for some reason, compile and run this the same way you'd run your jar. But be warned, relying on the order of the options is a really bad idea.

public class TotalMemory
{
    public static void main(String[] args)
    {
         System.out.println("Total Memory: "+Runtime.getRuntime().totalMemory());
         System.out.println("Free Memory: "+Runtime.getRuntime().freeMemory());
    }
}

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