ExecutorService在java中使用大型for循环非常慢

Question

我试图对带有threds池的文件进行操作但没有运气，它非常慢......

这是我试过的：

    int chunks = Runtime.getRuntime().availableProcessors();
    ExecutorService service = Executors.newCachedThreadPool();
    int iterations = listOfFiles.length;
    if(chunks > iterations)
        chunks = iterations;

    for(int i = 0; i < chunks; i++){
        final int from = iterations / chunks * i;
        final int to = iterations / chunks * (i + 1);
        service.submit(new Thread(){
            @Override
            public void run() {
                for(int j = from; j < to; j++) {
                    File curFile = listOfFiles[j];
                    ....
                }
            }
        });
    }

        service.shutdown();
        try {
            service.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);
        } catch (InterruptedException e) {}

当：

iterations = 150,000;
chunks = 4;

实际上每组做4次。它看起来像：

file
file
file
file
------its stop for 2-3 seconds---
file
file
file
file
------its stop for 2-3 seconds---
file
file
file
file
------its stop for 2-3 seconds---
.......

如果不停止每组2-3秒，我怎么能更快地完成它？

tnx很多