Java -Xmx，系统上的最大内存 [英] Java -Xmx, Max memory on system

问题描述

我的Java应用程序通过运行java -jar j.jar进程运行另一个Java应用程序。众所周知，J.jar根据给定的数据集使用大量内存，并且经常会获得OutOfMemoryError堆。所以我想在它上面使用-Xmx，这样我就可以分配尽可能多的内存（或接近）。我想在系统上获取总内存，然后在-Xmx中指定80-90％的内存。

My Java application runs another Java application, by running the process "java -jar j.jar". J.jar is known to use a LOT of memory depending on the dataset it is given, and often gets an OutOfMemoryError heap. So I want to use -Xmx on it, so that I can allocate as much memory as possible (or close to). I was thinking of getting the total memory on the system, then specifying 80-90% of that in -Xmx.

我的问题是否有任何解决方案？并且，我的解决方案如何发声？

Is there any solution to my problem? And, how does my solution sound?

编辑：我无法减少内存消耗，因为正在使用的内存是Java的内置pack200压缩，我正在使用它打包一些JAR文件。

I cant reduce the memory consumption as the memory being used is by Java's built-in pack200 compression, which I am using to pack some JAR files.

推荐答案

根据您的操作系统，这可能有助于获得可用和可用的内存大小：

Depending on your OS, this might work for getting the free and available memory size:

java.lang.management.OperatingSystemMXBean mxbean = java.lang.management.ManagementFactory.getOperatingSystemMXBean();
com.sun.management.OperatingSystemMXBean sunmxbean = (com.sun.management.OperatingSystemMXBean) mxbean;
long freeMemory = sunmxbean.getFreePhysicalMemorySize();
long availableMemory = sunmxbean.getTotalPhysicalMemorySize();

从那里，你可以计算出80-90％并启动你最大内存大小的jar希望。

From there, you can figure out 80-90% and launch your jar with the max memory size you want.

我不知道这适用于所有操作系统（即Windows），但是当我用OSX和Linux测试时它都有用。

I don't know that this works with all OS's (i.e. Windows), but it worked when I tested it with both OSX and Linux.

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