simple test using threads

create_threads.groovy

import java.util.concurrent.CountDownLatch 

class MyRunnable implements Runnable {
    def myParam, latch
    public MyRunnable(String myParam, CountDownLatch latch){
        this.myParam = myParam;
        this.latch = latch
    }
    public void run(){
       try {
           Thread.sleep(1000)
       } finally {
           latch.countDown()
       }
    }
}

def num_threads = 3
final CountDownLatch latch = new CountDownLatch(num_threads)
def s = System.currentTimeMillis()
for (int i = 0; i < num_threads; ++ i)
{
    ( new Thread(  new MyRunnable("test" + i, latch)  ) ).start()
}
latch.await();
println ( System.currentTimeMillis() - s )