006-多线程-JUC线程池-并发测试程序

Posted 2022-06-16 bjlhx

tags:

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一、java代码模拟并发

1.1、一次并发

单次并发测试

1、使用CountDownLatch

　　等待一个或多个线程一起执行

　　详细参看：007-多线程-锁-JUC锁-CountDownLatch-闭锁【允许一个或多个线程，等待其他一组线程完成操作，再继续执行】

示例代码

    @Test
    public void poolCountDownLatch() throws Exception 
        int parrelnum=100;
        //所有线程阻塞，然后统一开始
        CountDownLatch begin = new CountDownLatch(1);
        //主线程阻塞，直到所有分线程执行完毕
        CountDownLatch end = new CountDownLatch(parrelnum);
        List<Future<String>> futureList = new ArrayList<>();
        ExecutorService fixedThreadPool = Executors.newFixedThreadPool(parrelnum);
        for (int i = 0; i < parrelnum; i++) 
            Future<String> submit = fixedThreadPool.submit(() -> 
                try 
                    //begin 阻塞所有线程
                    begin.await();
                    System.out.println("======-----------------------------"+ LocalDateTime.now());
//                    System.out.println("======-----------------------------"+ LocalDateTime.now()
//                            +":"+Thread.currentThread().getName()
//                            +"；守护线程："+Thread.currentThread().isDaemon());
                    Thread.sleep(new Random().nextInt(2000));
                 catch (InterruptedException e) 
                    e.printStackTrace();
                
                finally 
                    //end 执行完代码减一
                    end.countDown();
                
                return "ok:"+LocalDateTime.now();
            );
            futureList.add(submit);
        
        fixedThreadPool.shutdown();

        try 
            System.out.println(LocalDateTime.now()+":"+"1秒后统一开始");
            Thread.sleep(1000);
            //begin 减一 = 0 唤醒 阻塞的所有线程
            begin.countDown();
            for (Future<String> future : futureList) 
                System.out.println(future.get());
            
            //end 等待所有代码执行完毕
            end.await();
            System.out.println(LocalDateTime.now()+":"+"全部结束");
         catch (InterruptedException e) 
            e.printStackTrace();

输出：

2019-08-02T22:58:23.762:1秒后统一开始
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======-----------------------------2019-08-02T22:58:24.769
ok:2019-08-02T22:58:24.924
ok:2019-08-02T22:58:25.803
ok:2019-08-02T22:58:26.473
ok:2019-08-02T22:58:25.947
ok:2019-08-02T22:58:25.891
ok:2019-08-02T22:58:25.859
ok:2019-08-02T22:58:25.457
ok:2019-08-02T22:58:26.443
ok:2019-08-02T22:58:25.457
ok:2019-08-02T22:58:26.157
ok:2019-08-02T22:58:25.003
ok:2019-08-02T22:58:24.979
ok:2019-08-02T22:58:25.698
ok:2019-08-02T22:58:25.084
ok:2019-08-02T22:58:25.102
ok:2019-08-02T22:58:26.083
ok:2019-08-02T22:58:26.377
ok:2019-08-02T22:58:25.669
ok:2019-08-02T22:58:26.360
ok:2019-08-02T22:58:26.640
ok:2019-08-02T22:58:26.321
ok:2019-08-02T22:58:26.087
ok:2019-08-02T22:58:26.226
ok:2019-08-02T22:58:24.833
ok:2019-08-02T22:58:26.736
ok:2019-08-02T22:58:25.497
ok:2019-08-02T22:58:25.374
ok:2019-08-02T22:58:26.377
ok:2019-08-02T22:58:26.764
ok:2019-08-02T22:58:24.889
ok:2019-08-02T22:58:26.419
ok:2019-08-02T22:58:25.174
ok:2019-08-02T22:58:25.447
ok:2019-08-02T22:58:24.957
ok:2019-08-02T22:58:24.817
ok:2019-08-02T22:58:24.809
ok:2019-08-02T22:58:26.764
ok:2019-08-02T22:58:26.035
ok:2019-08-02T22:58:25.855
ok:2019-08-02T22:58:26.310
ok:2019-08-02T22:58:26.412
ok:2019-08-02T22:58:26.210
ok:2019-08-02T22:58:25.569
ok:2019-08-02T22:58:25.039
ok:2019-08-02T22:58:25.846
ok:2019-08-02T22:58:26.328
ok:2019-08-02T22:58:24.802
ok:2019-08-02T22:58:25.970
ok:2019-08-02T22:58:25.970
ok:2019-08-02T22:58:25.475
ok:2019-08-02T22:58:26.147
ok:2019-08-02T22:58:25.937
ok:2019-08-02T22:58:26.525
ok:2019-08-02T22:58:25.527
ok:2019-08-02T22:58:24.871
ok:2019-08-02T22:58:26.246
ok:2019-08-02T22:58:24.786
ok:2019-08-02T22:58:25.484
ok:2019-08-02T22:58:25.871
ok:2019-08-02T22:58:25.240
ok:2019-08-02T22:58:24.899
ok:2019-08-02T22:58:24.889
ok:2019-08-02T22:58:25.559
ok:2019-08-02T22:58:24.856
ok:2019-08-02T22:58:24.783
ok:2019-08-02T22:58:25.257
ok:2019-08-02T22:58:26.394
ok:2019-08-02T22:58:26.471
ok:2019-08-02T22:58:25.957
ok:2019-08-02T22:58:25.930
ok:2019-08-02T22:58:25.316
ok:2019-08-02T22:58:25.323
ok:2019-08-02T22:58:26.381
ok:2019-08-02T22:58:26.552
ok:2019-08-02T22:58:26.577
ok:2019-08-02T22:58:25.369
ok:2019-08-02T22:58:26.157
ok:2019-08-02T22:58:25.937
ok:2019-08-02T22:58:26.030
ok:2019-08-02T22:58:26.693
ok:2019-08-02T22:58:24.982
ok:2019-08-02T22:58:25.511
ok:2019-08-02T22:58:25.042
ok:2019-08-02T22:58:26.307
ok:2019-08-02T22:58:25.769
ok:2019-08-02T22:58:25.710
ok:2019-08-02T22:58:26.699
ok:2019-08-02T22:58:26.047
ok:2019-08-02T22:58:26.056
ok:2019-08-02T22:58:24.822
ok:2019-08-02T22:58:26.204
ok:2019-08-02T22:58:24.803
ok:2019-08-02T22:58:26.257
ok:2019-08-02T22:58:25.701
ok:2019-08-02T22:58:24.964
ok:2019-08-02T22:58:25.678
ok:2019-08-02T22:58:24.858
ok:2019-08-02T22:58:25.741
ok:2019-08-02T22:58:26.153
ok:2019-08-02T22:58:26.023
2019-08-02T22:58:26.766:全部结束

View Code

可以看到 100个线程并发，同时并发，64-73毫秒之间即 9毫秒

2、不使用CountDownLatch

    @Test
    public void poolNoCountDownLatch() throws Exception 
        int parrelnum=100;
        List<Future<String>> futureList = new ArrayList<>();
        ExecutorService fixedThreadPool = Executors.newFixedThreadPool(parrelnum);
        for (int i = 0; i < parrelnum; i++) 
            Future<String> submit = fixedThreadPool.submit(() -> 
                try 
                    System.out.println("======-----------------------------"+ LocalDateTime.now());
//                    System.out.println("======-----------------------------"+ LocalDateTime.now()
//                            +":"+Thread.currentThread().getName()
//                            +"；守护线程："+Thread.currentThread().isDaemon());
                    Thread.sleep(new Random().nextInt(2000));
                 catch (InterruptedException e) 
                    e.printStackTrace();
                
                return "ok:"+LocalDateTime.now();
            );
            futureList.add(submit);
        
        fixedThreadPool.shutdown();

        try 
            System.out.println(LocalDateTime.now()+":"+"1秒后统一开始");
            Thread.sleep(1000);
            for (Future<String> future : futureList) 
                System.out.println(future.get());
            
            System.out.println(LocalDateTime.now()+":"+"全部结束");
         catch (InterruptedException e) 
            e.printStackTrace();

可以看到 100个线程并发，同时并发，91-96毫秒之间即 5毫秒

com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 -junit4 com.github.bjlhx15.common.base.thread.spring.controller.ThreadPoolExecutorParrelTest,poolNoCountDownLatch
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2019-08-02T23:02:42.493:1秒后统一开始
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ok:2019-08-02T23:02:43.998
ok:2019-08-02T23:02:43.772
ok:2019-08-02T23:02:42.961
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ok:2019-08-02T23:02:43.533
ok:2019-08-02T23:02:44.004
ok:2019-08-02T23:02:42.856
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ok:2019-08-02T23:02:44.190
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ok:2019-08-02T23:02:43.698
ok:2019-08-02T23:02:43.689
ok:2019-08-02T23:02:43.733
ok:2019-08-02T23:02:43.459
ok:2019-08-02T23:02:43.546
ok:2019-08-02T23:02:44.067
ok:2019-08-02T23:02:44.494
ok:2019-08-02T23:02:44.054
ok:2019-08-02T23:02:43.923
2019-08-02T23:02:44.495:全部结束

Process finished with exit code 0

View Code

3、小结

故针对上述一次并发不推荐使用CountDownLatch增加程序复杂度

1.2、循环并发

如，15个线程，每5个一组循环并发测试

    @Test
    public void poolCyclicBarrier() throws Exception 
        int parrelnum = 5;
        //所有线程阻塞，然后统一开始
        CyclicBarrier cyclicBarrier = new CyclicBarrier(parrelnum);
        List<Future<String>> futureList = new ArrayList<>();
        ExecutorService fixedThreadPool = Executors.newFixedThreadPool(parrelnum);
        for (int i = 0; i < 15; i++) 
            Future<String> submit = fixedThreadPool.submit(() -> 
                try 
                    Thread.sleep(new Random().nextInt(2000));
                    //begin 阻塞所有线程
                    cyclicBarrier.await();
                    System.out.println("======-----------------------------并发：" + LocalDateTime.now());
                    Thread.sleep(new Random().nextInt(2000));
                    System.out.println("======-----------------------------" + LocalDateTime.now()
                            + ":" + Thread.currentThread().getName()
                            + "；守护线程：" + Thread.currentThread().isDaemon());
                 catch (InterruptedException e) 
                    e.printStackTrace();
                
                return "ok:" + LocalDateTime.now();
            );
            futureList.add(submit);
        

        for (Future<String> future : futureList) 
            future.get();
//                System.out.println(future.get());

输出

======-----------------------------并发：2019-08-06T21:11:21.970
======-----------------------------并发：2019-08-06T21:11:21.970
======-----------------------------并发：2019-08-06T21:11:21.970
======-----------------------------并发：2019-08-06T21:11:21.970
======-----------------------------并发：2019-08-06T21:11:21.970
======-----------------------------2019-08-06T21:11:22.488:pool-1-thread-2；守护线程：false
======-----------------------------2019-08-06T21:11:22.610:pool-1-thread-1；守护线程：false
======-----------------------------2019-08-06T21:11:22.635:pool-1-thread-4；守护线程：false
======-----------------------------2019-08-06T21:11:23.222:pool-1-thread-5；守护线程：false
======-----------------------------2019-08-06T21:11:23.807:pool-1-thread-3；守护线程：false
======-----------------------------并发：2019-08-06T21:11:25.161
======-----------------------------并发：2019-08-06T21:11:25.161
======-----------------------------并发：2019-08-06T21:11:25.161
======-----------------------------并发：2019-08-06T21:11:25.161
======-----------------------------并发：2019-08-06T21:11:25.161
======-----------------------------2019-08-06T21:11:26.123:pool-1-thread-2；守护线程：false
======-----------------------------2019-08-06T21:11:26.183:pool-1-thread-4；守护线程：false
======-----------------------------2019-08-06T21:11:26.295:pool-1-thread-3；守护线程：false
======-----------------------------2019-08-06T21:11:26.701:pool-1-thread-5；守护线程：false
======-----------------------------2019-08-06T21:11:27.016:pool-1-thread-1；守护线程：false
======-----------------------------并发：2019-08-06T21:11:28.752
======-----------------------------并发：2019-08-06T21:11:28.752
======-----------------------------并发：2019-08-06T21:11:28.752
======-----------------------------并发：2019-08-06T21:11:28.752
======-----------------------------并发：2019-08-06T21:11:28.752
======-----------------------------2019-08-06T21:11:28.983:pool-1-thread-3；守护线程：false
======-----------------------------2019-08-06T21:11:29.548:pool-1-thread-5；守护线程：false
======-----------------------------2019-08-06T21:11:29.668:pool-1-thread-1；守护线程：false
======-----------------------------2019-08-06T21:11:29.827:pool-1-thread-2；守护线程：false
======-----------------------------2019-08-06T21:11:29.868:pool-1-thread-4；守护线程：false

二、

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