Revision history [back]

I'm using OpenCV's(3.4.1) JNI wrapper as port for to use OpenCV in Java, and i need handle a lots jpeg images.

It's fine and no memory leak if handle in single thread. But huge memory leak when using multiple threads.

Can anyone help me fix this?

My code:

  int nThreads = 128;
  ExecutorService pool = Executors.newFixedThreadPool(nThreads);
  while (true) {
  CountDownLatch ready = new CountDownLatch(nThreads);
  CountDownLatch start = new CountDownLatch(1);
  CountDownLatch end = new CountDownLatch(nThreads);
  for (int i = 0; i < nThreads; i++) {
    int index = i;   
    pool.execute(() -> {
      ready.countDown();
      try {
          start.await();
      } catch (InterruptedException e) {
        e.printStackTrace();     
      }    
      Mat mat = Imgcodecs.imread(files[index].getAbsolutePath(), Imgcodecs.IMREAD_COLOR);
      mat.free(); // same as release() and n_delete() 
      end.countDown();    
    }); 
  }  
  ready.await();  
  start.countDown();  
  end.await();  
  System.out.println("Sleep");  
  Thread.sleep(5000);
  }