Java内存测试-如何消耗计算机上的所有内存（RAM）

╰半橙微兮° 2023-10-05 16:10 59阅读 0赞

如下是**Java** **内存**消耗程序的源代码。其目的是消耗PC上的所有**内存**（RAM）。它尝试分配1 MB的字节数组，直到用完RAM。

import java.util.Vector;
    
    public class MemoryEater {
        public static void main(String[] args) {
            Vector v = new Vector();
            int i = 0;
            while (true) {
                byte b[] = new byte[1048576];
                v.add(b);
                i = i + 1;
                Runtime rt = Runtime.getRuntime();
                System.out.println("Total Memory = " +
                    rt.totalMemory() +
                    " Free Memory = " +
                    rt.freeMemory() +
                    " Allocated Memory = " +
                    i +
                    "MB");
            }
        }
    }

使用选项（如下所示）运行此**Java** **内存**消耗程序也很重要，\-Xmx以确保您的JVM获得了您希望它拥有的所有**内存**：

$ **java** **-Xmx1024M MemoryEater**

上面显示的示例将尝试消耗多达1,024 MB RAM（1 GB）。

当我多次开始显示Windows蓝屏死机时，我编写了与此类似的程序。我发现发生了某种类型的硬件故障，因此我向RAM中写入了很多内容，然后将其读回以查看是否可以通过这种方式找到问题。

IBM J9 JDK 1.4.2 32bit On AIX 64 bit测试结果:

\# /usr/java14/bin/java -Xmx6910m MemoryEater  
Total Memory = 2950756864 Free Memory = 2948381040  
Total Memory = 2950756864 Free Memory = 2947332448

...

Total Memory = 2950756864 Free Memory = 1073272  
JVMDG217: Dump Handler is Processing OutOfMemory - Please Wait.  
JVMDG315: JVM Requesting Heap dump file  
JVMDG318: Heap dump file written to //heapdump18743486.1608351347.phd  
JVMDG303: JVM Requesting Java core file  
JVMDG304: Java core file written to //javacore18743486.1608351348.txt  
JVMDG274: Dump Handler has Processed OutOfMemory.  
JVMST109: Insufficient space in Javaheap to satisfy allocation request  
Exception in thread "main" java.lang.OutOfMemoryError  
at MemoryEater.main(MemoryEater.java(Compiled Code))

2950756864/1024/1024=2814.061035MB