如何在Python中将工作分配给一组工作线程？-Python教程-PHP中文网

如何在Python中将工作分配给一组工作线程？

王林

发布： 2023-08-26 16:17:14

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如何在python中将工作分配给一组工作线程？

要在一堆工作线程之间分配工作，请使用并发.futures 模块，尤其是 ThreadPoolExecutor 类。

有了这个替代方案，如果您想精细控制调度算法，您可以手动编写自己的逻辑。使用队列模块创建包含作业列表的队列。 Queue 类维护一个对象列表，并具有将项目添加到队列的 .put(obj) 方法和返回项目的 .get() 方法。该类将负责必要的锁定，以确保每个作业只分发一次。

示例

以下是一个示例 -

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import threading, queue, time

# The worker thread gets jobs off the queue. When the queue is empty, it
# assumes there will be no more work and exits.
def worker():
   print('Running worker')
   time.sleep(0.1)
   while True:
      try:
         arg = q.get(block=False)
      except queue.Empty:
         print('Worker', threading.current_thread(), end=' ')
         print('queue empty')
         break
      else:
         print('Worker', threading.current_thread(), end=' ')
         print('running with argument', arg)
         time.sleep(0.5)

# Create a queue
q = queue.Queue()

# Start a pool of 5 workers
for i in range(5):
   t = threading.Thread(target=worker, name='worker %i' % (i+1))
   t.start()

# Begin adding work to the queue
for i in range(50):
   q.put(i)

# Give threads time to run
print('Main thread sleeping')
time.sleep(5)

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输出

Running worker
Running worker
Running worker
Running worker
Running worker
Main thread sleeping
Worker  running with argument 0
Worker  running with argument 1
Worker  running with argument 2
Worker  running with argument 3
Worker  running with argument 4
Worker  running with argument 5
Worker  running with argument 6
Worker  running with argument 7
Worker  running with argument 8
Worker  running with argument 9
Worker  running with argument 10
Worker  running with argument 11
Worker  running with argument 12
Worker  running with argument 13
Worker  running with argument 14
Worker  running with argument 15
Worker  running with argument 16
Worker  running with argument 17
Worker  running with argument 18
Worker  running with argument 19
Worker  running with argument 20
Worker  running with argument 21
Worker  running with argument 22
Worker  running with argument 23
Worker  running with argument 24
Worker  running with argument 25
Worker  running with argument 26
Worker  running with argument 28
Worker  running with argument 29
Worker  running with argument 27
Worker  running with argument 30
Worker  running with argument 31
Worker  running with argument 32
Worker  running with argument 33
Worker  running with argument 34
Worker  running with argument 35
Worker  running with argument 36
Worker  running with argument 37
Worker  running with argument 38
Worker  running with argument 39
Worker  running with argument 40
Worker  running with argument 41
Worker  running with argument 42
Worker  running with argument 43
Worker  running with argument 44
Worker  running with argument 45
Worker  running with argument 46
Worker  running with argument 47
Worker  running with argument 48
Worker  running with argument 49
Worker  queue empty
Worker  queue empty
Worker  queue empty
Worker  queue empty
Worker  queue empty

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