Java OpenJDK 17 堆内存问题

我的代码是:

public class Memory {
// Dummy Entity representing usual data objects
private static class Entity {
    public String name;
    public String detail;
    public Double amount;
    public Integer age;
}

// Linked list offers table inserts and helps illustrating the issue by using multiple
// references per entry
public static java.util.LinkedList<Entity> entities = new java.util.LinkedList<>();

// This threshold should be 2 times Xmn. It ensures the loop stops before a full GC happens.
private static final int MB = 1024 * 1024;
private static final int THRESHOLD = 100 * MB;

public static void main(String[] args) {
    System.out.println("Total Memory (in bytes): " + Runtime.getRuntime().totalMemory());
    System.out.println("Free Memory (in bytes): " + Runtime.getRuntime().freeMemory());
    System.out.println("Max Memory (in bytes): " + Runtime.getRuntime().maxMemory());

    while (true) {
        appendEntitiesToDataStructure();
        terminateBeforeFullGCorOOMEcanHappen();
    }
}

private static void appendEntitiesToDataStructure() {
    entities.add(new Entity());
}

private static void terminateBeforeFullGCorOOMEcanHappen() {
    if (Runtime.getRuntime().freeMemory() < THRESHOLD) {
        System.out.println("Elements created and added to LinkedList: " + entities.size());
        System.exit(0);
    }
}}

启动:

java -Xms${i}g -Xmx${i}g -Xmn50m memory.java >> output.txt

idea :我想知道JVM堆大小在演变时的行为.

堆大小:从1 GB到100 GB

GC测试:G1c、ZGC、PGC

结果:使用g1c和pgc会出现从32 GB开始的回归--随着堆大小的增加，我可以在对象中存储更少的数据.

模式:X:我的对象的大小；Y:堆大小

我不知道该如何解释这种行为--&gt；你知道吗？