Java内存测试-如何消耗计算机上的所有内存（RAM）-蒲公英云

Java内存测试-如何消耗计算机上的所有内存（RAM）

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