PSYoungGen有错误的空间

Question

public class EdenDemo {

private static final int _1MB = 1024 * 1024;

/**
 * vm arguments：-verbose:gc -Xms20M -Xmx20M -Xmn10M -XX:+PrintGCDetails -XX:SurvivorRatio=8
 */

public static void testAllocation(){
    byte[] allocation1, allocation2, allocation3, allocation4;
    allocation1 = new byte[2 * _1MB];
    allocation2 = new byte[2 * _1MB];
    allocation3 = new byte[2 * _1MB];
    allocation4 = new byte[4 * _1MB];
}

public static void main(String[] args) {
    testAllocation();
}

}

Answer 1

引用日志

... eden space 8192K, 77% used ...
... from space 1024K, 96% used ...
... to space 1024K, 0% used ...

Young space-xmn是eden、S0、S1的总和(from和to与S0、S1相同，尽管S0对于一半的集合具有from角色，对于其他集合具有to/code>角色，对于S1相同）。

Eden+从+到=10MIB。