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软件应该做一些计算:总共 62500 个循环,一个循环持续时间是 0.5 秒。那将是大约 8 小时的工作(for in for in for)。我必须分成 100 个单独的线程,工作时间将减少到 8 分钟。我无法打开 62500 个线程,因为 CPU,我必须找到仅打开 100 个线程而不是再次打开 100 个线程的解决方案。我尝试使用 CountDownLatch 但我无法重置循环,所以我的解决方案是 CyclicBarrier。

private CycleBarrier cb;

// this Overrided run is called only once from the view to not block the UI.
@Override
public void run(){

   // count is the number of the actions that i want to do
   // this is why I'm using CycleBarrier
   for(int count = 0; count < 2; count++){
      System.out.println("MAIN THREAD: #"+count);

      int x1 = 0;
      cb = new CycleBarrier(100, new Runnable(){
         @Override
         public void run(){
            // HOW TO STOP CYCLE ???
         }
      });

      for(int i = 0; i < 100; i++){
         new Thread(new Test(x1, cb)).start();
         x1 += 25;
      }
   }
}

测试

public class Test implements Runnable{

   int x1;
   CycleBarrier cb;

   public Test(int _x1, CycleBarrier _cb){
      x1 = _x1;
      cb = _cb;
   }

   @Override
   public void run(){
      // this for in for has 6250 loops
      for(int i = x1; < x1+25; i++){
         for(int j = 0; j < 250; j++){
            System.out.println("   |--> LOOK I'm WORKING: "+i+" "+j);
         }
      }

      // After the job is done, it should be put in to await
      cb.await();
   }
}

循环不工作。一下子开200个。我尝试调试(eclipse)但我不知道为什么,线程从一个跳到另一个,我无法跟踪结果。

控制台应如下所示:

MAIN THREAD: #0
   LOOK I'm WORKING: 0 0
   LOOK I'm WORKING: 0 1
   ...
   LOOK I'm WORKING: 25 254
   LOOK I'm WORKING: 25 255

MAIN THREAD: #1
   LOOK I'm WORKING: 0 0
   LOOK I'm WORKING: 0 1
   ...
   LOOK I'm WORKING: 25 254
   LOOK I'm WORKING: 25 255
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1 回答 1

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cb = new CycleBarrier(100, new Runnable(){
@Override
 public void run(){
        // HOW TO STOP CYCLE ???
     }
  });

  for(int i = 0; i < 100; i++){
     new Thread(new Test(x1, cb)).start();
     x1 += 25;
  }

在您的代码中,您将在新的 Runnable 中打开一个新的线程对象。所以有两个线程。

于 2013-02-12T02:25:13.367 回答