使用VM命令行查找执行期间最大分配的堆大小？

发布于 2025-01-02 07:03:49 字数 728 浏览 1 评论 0原文

我想知道是否可以使用 VM 命令行获取分配的堆的最大大小。

从现在开始，我可以使用 Netbeans Profiler 获取它，但我更喜欢无需启动额外的应用程序即可获取结果。

我也在使用这种方法：

public void printMemUsage(){
        double currentMemory = ( (double)((double)(Runtime.getRuntime().totalMemory()/1024.0)))- ((double)((double)(Runtime.getRuntime().freeMemory()/1024.0)));
        System.out.println("Current memory usage in kilobytes :"+currentMemory);
}

我想我也可以使用它来获取最大堆大小，但我不确定它是否非常可靠。

我目前使用这些命令行：

-verbose:gc -XX:+PrintGCDetails -XX:+PrintGCApplicationConcurrentTime -XX:+PrintGCApplicationStoppedTime

为了获得有关 gc 活动、年轻代、老一代和永久代的良好信息。但我只能在收集发生时知道当前的总堆空间。

那么有没有办法获取使用其他命令行分配的最大堆空间？

原文

I wonder if I can obtain the maximum size of the allocated heap using VM command line.

From now I'm able to get it using Netbeans Profiler but I prefer getting result without have to launch an extra application.

I'm also using this method :

public void printMemUsage(){
        double currentMemory = ( (double)((double)(Runtime.getRuntime().totalMemory()/1024.0)))- ((double)((double)(Runtime.getRuntime().freeMemory()/1024.0)));
        System.out.println("Current memory usage in kilobytes :"+currentMemory);
}

I think I can use this to get the maximum heap size too but I'm not sure if it's very reliable.

I currently use those command lines :

-verbose:gc -XX:+PrintGCDetails -XX:+PrintGCApplicationConcurrentTime -XX:+PrintGCApplicationStoppedTime

In order to get good information about gc activity, young generation, old and permanent. But I just can tell the current total heap space when collections occurs.

So is there a way to get the max heap space that have been alocated using other command lines?

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