Java中的非fork-join执行服务中是否存在等效的isQuiescent？(Is there an equivalent of isQuiescent in non-fork-join executor services in Java?)

 我在ForkJoin和FixedSizeThreadPool中实现了我的问题的两个实现，我想比较它们的性能。 在我的问题中，每个任务都会创建一些子任务，并将它们再次提交给执行程序服务。 在fork-join实现中，我使用fork（），而在另一个实现中，我使用execute（）。 
 
 显然，我的主线程需要等到整个工作完成。 在fork-join中，我可以优雅地检查isQuiescent（）属性以确保一切都已完成，但在另一种情况下，我想不出比手动计算我创建了多少任务以及完成了多少任务更好的事情！ 这个解决方案有效，但代价是共享变量显然会降低我的性能。 
 
 我不能只使用shutdown（），因为那时子任务不会被调度（它们会得到RejectedExecutionException）。 
 
 有谁知道比计算任务更好的解决方案？ 

I have made two implementations of my problem in ForkJoin and FixedSizeThreadPool and I want to compare their performances. In my problem, each task will create some sub-tasks and will submit them to the executor service again. In the fork-join implementation, I use fork() and in the other one, I use execute().
 
Obviously, my main thread needs to wait until the whole work has finished. In fork-join, I can gracefully check the isQuiescent() property to make sure everything has finished, but in the other case, I cannot think of anything better than manually counting how many tasks I have created and how many have finished! This solution works, but at the cost of a shared variable that obviously reduces my performance.
 
I cannot just use shutdown(), because then the sub-tasks will not be scheduled (they will get RejectedExecutionException).
 
Does anybody know a better solution than counting the tasks?

原文：https://stackoverflow.com/questions/14441540