Isn't it possible to have 10k-40k threads in latest OSX?

Question

I've checked these two posts OSX 10.6.3 and JVM support about threads limit in StackOverflow, but when I tried to test my system thread count limit using the following test, I will always get far less (like about 2000) than they mentioned in these two posts (like 40_000).

I also check this less is more about thread limit to make more local tests, but the results are still very frustrating.

F.Y.I

Using sysctl kern.num_threads to check thread limit in my mac and I got kern.num_threads: 10240

-Xmx2048m -Xms2048m -Xss200k ==> 1286
-Xmx4096m -Xms3072m -Xss320k ==> 1048
-Xmx4096m -Xms3072m          ==> 1153
-Xmx32m   -Xms32m            ==> 1309
-Xmx32m                      ==> 2027

Is there something I missed to result in this bad performance (low thread limit)?

public class TestThreadCountLimit {
    private static Object s = new Object();
    private static int count = 0;

    public static void main(String[] argv) {
        for (; ; ) {
            Thread thread = new Thread(() -> {
                synchronized (s) {
                    count += 1;
                    System.err.println("New thread #" + count);
                }
                for (; ; ) {
                    try {
                        Thread.sleep(1000);
                    } catch (Exception e) {
                        System.err.println(e);
                    }
                }
            });
            thread.setDaemon(true); // to ensure I can terminate them, I set them daemon on purpose;
            thread.start();
        }
    }
}