PYTHON多进程编码结束之进程池POOL

最新推荐文章于 2024-08-12 11:15:00 发布

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最新推荐文章于 2024-08-12 11:15:00 发布

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文章标签： python

原文链接：https://yq.aliyun.com/articles/45091

本文通过两个实例展示了Python中如何利用multiprocessing模块创建并管理进程池。第一个实例演示了使用单个进程池处理异步任务并获取结果的过程；第二个实例则展示了如何利用进程池并发执行多个独立的任务。

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结束昨晚开始的测试。

最后一个POOL。

A，使用POOL的返回结果

#coding: utf-8
import multiprocessing
import time
 
def func(msg):
    print 'msg:', msg
    time.sleep(3)
    print 'end'
    return 'done', msg

if __name__ == '__main__':
    pool = multiprocessing.Pool(processes=3)
    result = []
    for i in xrange(4):
        msg = 'hello %d' %(i)
        result.append(pool.apply_async(func, (msg, )))

    print 'Mark..Mark..Mark...'
    pool.close()
    pool.join()
    print 'Sub-process(es) done.'
    for res in result:
        print ':::', res.get()

B，多个进程池

#coding: utf-8
import multiprocessing
import time, random, os

def Lee():
    print 'Run task Lee-%s' % (os.getpid())
    start = time.time()
    time.sleep(random.random() * 10)
    end = time.time()
    print 'Task Lee, runs %0.2f seconds.' % (end - start)

def Marlon():
    print 'Run task Marlon-%s' % (os.getpid())
    start = time.time()
    time.sleep(random.random() * 10)
    end = time.time()
    print 'Task Marlon, runs %0.2f seconds.' % (end - start)

def Allen():
    print 'Run task Allen-%s' % (os.getpid())
    start = time.time()
    time.sleep(random.random() * 10)
    end = time.time()
    print 'Task Allen, runs %0.2f seconds.' % (end - start)

def Frank():
    print 'Run task Frank-%s' % (os.getpid())
    start = time.time()
    time.sleep(random.random() * 10)
    end = time.time()
    print 'Task Frank, runs %0.2f seconds.' % (end - start)

if __name__ == '__main__':
    function_list = [Lee, Marlon, Allen, Frank]
    print 'parent process %s' % (os.getpid())

    pool = multiprocessing.Pool(4)
    for func in function_list:
        pool.apply_async(func)

    print 'Waiting for all subprocess done...'
    pool.close()
    pool.join()
    print 'All subprocesses done.'

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