sun.misc.GC设置GC频率

public class GcTest {
    public static void main(String[] args) {
        try {
            Class<?> clazz = Class.forName("sun.misc.GC");
            Method requestLatency = clazz.getMethod("requestLatency", new Class[] { long.class });
            requestLatency.invoke(null, 10000L);
            new GcTest().new MemThread().start();
            Thread.sleep(1000000L);
        } catch (ClassNotFoundException e) {
        } catch (Exception e) {
        }

    }

    class MemThread extends Thread{
        @Override
        public void run(){
            while(true){
                {
                    Random r = new Random();
                    int i = r.nextInt(100);
                    System.out.println("create mem :"+i+"MB");
                    int size = i * 1024 * 1024;
                    byte[] bytes = new byte[size];
                }
                try {
                    Thread.sleep(2000L);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

手动设置代码GC频率为10s，然后创建异步线程进行随机内存空间开辟，通过监控看到内存回收情况。