看到java8里新的fork/join实现就用了work stealing的方式，更高效了 Parallel processing. In pre Java 8, the call to Arrays.sort( ) uses the merge sort algorithm sequentially. Java 8, introduces a new API for sorting the array in parallel with Arrays.parallelSort( ). Arrays.parallelSort( ) uses Fork/Join framework introduced in Java 7 to assign the sorting tasks to multiple threads available in the thread pool. Fork/Join implements a work stealing algorithm where an idle thread can steal tasks queued up in another thread.
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