java -verbose:gc -XX:+PrintGCDetails -XX:+PrintPromotionFailure -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+PrintGCDateStamps -Xmx1g -Xms1g -Xmn100m -XX:CMSInitiatingOccupancyFraction=99 GC 2000000

GC.java

import java.util.Random;

public class GC {
    static class Foo {
        byte[] raw;

        public Foo(int n) {
            raw = new byte[n];
        }
    }

    private void busyWait(int n) {
        int sum = 0;
        for (int i = 0; i < n * 1000; i++) {
            sum += (i * i - i);
        }
        if (sum == n) {
            System.out.println(sum);
        }
    }

    private void fill(int max, int unit, Foo[] f1, Foo[] f2) {
        for (int i = 0; i < max * 2; i++) {
            switch (i % 2){
            case 0:
                f1[(int)(i/2)] = new Foo(unit);
                break;
            case 1:
                f2[(int)(i/2)] = new Foo(unit);
                break;
            }
            busyWait(4);
        }
        System.out.println("fill done ================================================================");
    }

    public void run(int max) {
        Thread th = new Thread() {
            @Override
            public void run() {
                while (true) {
                    System.out.println(System.currentTimeMillis());
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                    }
                }
            }
        };
        th.setDaemon(true);
        th.start();

        Foo[] f1 = new Foo[max];
        Foo[] f2 = new Foo[max];
        fill(max, 100, f1, f2);
        f2 = new Foo[max];
        Foo[] f3 = new Foo[max];
        fill(max, 110, f2, f3);
        f3 = new Foo[max];
        Foo[] f4 = new Foo[max];
        fill(max, 120, f2, f3);
        System.out.println("done!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
    }

    public static void main(String[] args) throws Exception {
        int max = Integer.parseInt(args[0]);
        System.out.println(max);
        new GC().run(max);
    }
}