Pausable phases through a Semaphore

public class TwMain {

    // I have 8 cores.
    // If I set this to 2, then my CPU is at 25%
    // If I set this to 4, then my CPU is at 50%
    // If I set this to 6, then my CPU is at 74%
    // If I set this to 8, then my CPU is at 98%
    // If I set this to 10, then my CPU is at 98%
    private static final int ACTIVE_THREAD_LIMIT = 10;

    private final static Semaphore SEMAPHORE = new Semaphore(ACTIVE_THREAD_LIMIT, true);

    public static void main(String[] args) {
        for (int i = 0; i < 10; i++) {
            StringBuilder name = new StringBuilder();
            for (int j = 0; j < i + 1; j++) {
                name.append(i);
            }
            Thread thread = new Thread(new Runner(name.toString()));
            thread.start();
        }
    }

    public static class Runner implements Runnable {

        private final String name;
        private long count = 0;

        public Runner(String name) {
            this.name = name;
        }

        @Override
        public void run() {
            long start = System.currentTimeMillis();
            while (count < 3000) {
                if (count % 100 == 0) {
                    if (count != 0) {
                        SEMAPHORE.release();
                    }
                    try {
                        SEMAPHORE.acquire();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                        break;
                    }
                    System.out.println((System.currentTimeMillis() % 100000) + "  -  " + name + " = " + count);
                }
                drainCpu(10);
                count++;
            }
            System.out.println((System.currentTimeMillis() % 10000) + "  -  " + name + " finished in " + (System.currentTimeMillis() - start));
        }

        public void drainCpu(long millis) {
            long end = System.currentTimeMillis() + millis;
            long l = 0;
            while (System.currentTimeMillis() < end) {
                l = l + 1;
            }
        }
    }

}