我在网上找到了这段代码,预期结果应该显示当前正在处理的进程名称,但是当我运行代码时,它只给出了结果而没有名称。我运行的是Windows 7 Python 2.7.3。
代码:
import multiprocessing
def do_calculation(data):
return data * 2
def start_process():
print 'Starting', multiprocessing.current_process().name
if __name__ == '__main__':
inputs = list(range(10))
print 'Input :', inputs
builtin_outputs = map(do_calculation, inputs)
print 'Built-in:', builtin_outputs
pool_size = multiprocessing.cpu_count() * 2
pool = multiprocessing.Pool(processes=pool_size,
initializer=start_process,
)
pool_outputs = pool.map(do_calculation, inputs)
pool.close() # no more tasks
pool.join() # wrap up current tasks
print 'Pool :', pool_outputs
预期结果:
$ python multiprocessing_pool.py
Input : [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Built-in: [0, 2, 4, 6, 8, 10, 12, 14, 16, 18]
Starting PoolWorker-11
Starting PoolWorker-12
Starting PoolWorker-13
Starting PoolWorker-14
Starting PoolWorker-15
Starting PoolWorker-16
Starting PoolWorker-1
Starting PoolWorker-2
Starting PoolWorker-3
Starting PoolWorker-4
Starting PoolWorker-5
Starting PoolWorker-8
Starting PoolWorker-9
Starting PoolWorker-6
Starting PoolWorker-10
Starting PoolWorker-7
Pool : [0, 2, 4, 6, 8, 10, 12, 14, 16, 18]
do_calculation
函数体看起来像这样:return (data * 2, multiprocessing.current_process().name)
,其中它以元组形式返回data * 2
和工作进程名称。 - sberry