Python Multiprocessing Script Freezes Seemingly Without Error

Question

I am trying to use the multiprocessing package to call a function (let\'s call it myfunc) in parallel, specifically using pool.map i.e

Answer 1

Check whether all the processes are started or not.This will help you to debug it.Also add Pool.join() at the end of your code.

This is a sample code

def start_process():
    print 'Starting', multiprocessing.current_process().name

if __name__ == '__main__':

    pool_size =2
    pool = multiprocessing.Pool(processes=pool_size,
                                initializer=start_process,
                                )

    pool_outputs = pool.map(function_name,argument_list)
    pool.close() # no more tasks
    pool.join()  # wrap up current tasks