JVM 发生 GC 导致线程卡死问题

发表于 2021-09-20 更新于 2021-09-21 分类于 java

本文字数： 1.5k 阅读时长 ≈ 1 分钟

案例代码

public class OSRDemo {
    static long counter;

    public static void main(String[] args) throws Exception {
        System.out.println("main start");
        startBusinessThread();
        startProblemThread();
        // 等待线程启动执行
        Thread.sleep(500);
        // 执行GC
        System.gc();
        System.out.println("main end");
    }

    private static void startProblemThread() {
        new Thread(() -> {
            System.out.println("Problem start");
            for (int i = 0; i < 1000000; i++) {
                for (int j = 0; j < 100000; j++) {
                    counter += i % 33;
                    counter += i % 333;
                }
            }
        }).start();
    }

    private static void startBusinessThread() {
        new Thread(() -> {
            System.out.println(Thread.currentThread().getName() + " start");
            while (true) {
                System.out.println("执行业务一");
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "thread-01").start();
    }
}