why the multiprocessing stops

Question

I have followed the code in the link multiprocessing.Pool() slower than just using ordinary functions to write a multi process program, but I find when the length of data in mainwordlist is relatively large, the code can't work. (you can try by setting xrange(50) to xrange(1000) in the code)

Actually, the terminal interface shows that the code is still running, however, the process in top command is gone, can anyone tell me why? any comment will be appreciated. thank you!

Answer 1

I find the following link http://eli.thegreenplace.net/2012/01/16/python-parallelizing-cpu-bound-tasks-with-multiprocessing and reorganize my code. Both of them start from same method, but I avoid above problem though I still don't know why. Anyway, it works.