利用CountDownLatch工具类测试执行时间

多线程测试执行时间

final HelloService helloService = (HelloService)context.getBean("helloService"); // get service invocation proxy  
ExecutorService executorServicePool = Executors.newFixedThreadPool(200);  
final int size = 10000;  
final CountDownLatch cdl = new CountDownLatch(size);  
long begin = System.currentTimeMillis();  
for (int i = 0; i < size; i++) {  
    executorServicePool.execute(new Runnable() {  
        @Override  
        public void run() {  
            try {  
                  
                String hello = helloService.hello("aa"); // do invoke!  
                cdl.countDown();  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
        }  
    });  
}  
cdl.await();//等待所有任务处理完  
long time = System.currentTimeMillis() - begin;  
System.out.println("耗时：" + time);