On Unix, mutiprocessing works well with default creating new process method (fork). However, if I set the creating method as spawn, python exits abnormally. I could not get the reason why python exits abnormally. Here is my simple testing code:
def test_mp(): num_processes = 3 print("chengs++: mp start a new process with method: ", get_start_method()) set_start_method('spawn', force=True) print("chengs++: mp start a new process with method after resetting to spawn: ", get_start_method()) with Pool(num_processes) as pool: results = pool.starmap( doubler, zip(  * num_processes,  * num_processes, ), ) print(results) def doubler(number, r): result = number * 2 + r return result
If you have any clue, please let me know. Thanks in advance.