模拟异常对象过多导致频繁FullGC

gistfile1.txt

//如何模拟异常堆栈占用内存过多导致频繁FulGC
//java.lang.StackTraceElement数据已经占用了85M

//目前的代码不能很好的重现该问题

package com.hlj.test;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.apache.log4j.Logger;
/**
* 启动参数: -Xmx8m -Xms8m -XX:NewSize=2m -XX:MaxNewSize=2m -XX:+PrintGCDetails
* 参考文档: https://docs.oracle.com/cd/E13222_01/wls/docs81/perform/JVMTuning.html#1110613
https://docs.oracle.com/cd/E13222_01/wls/docs81/perform/JVMTuning.html
*/
public class FullGCByLogTest {
	private static final Logger log = Logger.getLogger(FullGCByLogTest.class);
	public static final byte[] _4M = new byte[4 * 1024 * 1024];
	public static List<Exception> list = new ArrayList<>();

	public static void main(String[] args) throws InterruptedException {
		int nThreads = 1200; // 并发数
		ExecutorService pool = Executors.newFixedThreadPool(nThreads);
		final CountDownLatch latch = new CountDownLatch(nThreads);
		for (int i = 0; i < nThreads; i++) {
			pool.submit(new Runnable() {
				@Override
				public void run() {
					latch.countDown();
					try {
						latch.await(); // 尽量等待一同执行
					} catch (InterruptedException e1) {
					}
					while (true) {
						try {
							int i = 1 / 0;
							System.out.println(i);
						} catch (Exception e) {
							log.error(e.getMessage(), e);
						}
						try {
							Thread.sleep(1000);
						} catch (InterruptedException e) {
						}
					}
				}
			});
		}

	}
}