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标题: python 将进程池放在装饰器里为什么不生效也没报错 [打印本页]
作者: 草帽路飞UU    时间: 2017-6-26 11:33
标题: python 将进程池放在装饰器里为什么不生效也没报错

我想把进程池封装在装饰器里，但是它既没生效也没报错

  1. def handle_request(response):
  2.     print str(response)

  4. def run_in_process(process_num):
  5.     def _run_in_process(f):
  6.         def __run_in_process(*args, **kwargs):
  7.             pool = multiprocessing.Pool(processes=process_num)
  8.             for i in range(process_num):
  9.                 pool.apply_async(f, args=args, kwds=kwargs, callback=kwargs.get("callback"))
  10.             pool.close()
  11.             pool.join()

  13.         return __run_in_process

  15.     return _run_in_process


  18. @run_in_process(process_num)
  19. def main():
  20.     http_client = AsyncHTTPClient()
  21.     http_client.fetch(url, callback=handle_request)
  22.     global loop
  23.     loop = tornado.ioloop.IOLoop.instance()
  24.     if loop._running is False:
  25.         loop.start()
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结果如下：
  1. /usr/bin/python2.7 /home/workspace/py_project/crawler/center/sample.py

  3. Process finished with exit code 0
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但是奇怪的是，我用多进程的方式重写一次，发现是可以生效的
  1. def handle_request(response):
  2.     print str(response)

  4. def run_in_process(process_num):
  5.     def _run_in_process(f):
  6.         def __run_in_process(*args, **kwargs):
  7.             _processes = []
  8.             for i in xrange(process_num):
  9.                 p = multiprocessing.Process(target=f, args=args, kwargs=kwargs)
  10.                 p.start()
  11.                 _processes.append(p)

  13.             for p in _processes:
  14.                 p.join()

  16.         return __run_in_process
  17.     return _run_in_process


  20. @run_in_process(process_num)
  21. def main():
  22.     http_client = AsyncHTTPClient()
  23.     http_client.fetch(url, callback=handle_request)
  24.     global loop
  25.     loop = tornado.ioloop.IOLoop.instance()
  26.     if loop._running is False:
  27.         loop.start()


  30. if __name__ == '__main__':
  31.     main()
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日志如下

  1. /usr/bin/python2.7 /home/workspace/py_project/crawler/center/sample.py
  2. HTTPResponse(_body=None,buffer=<_io.BytesIO object at 0x7f2fdaa21ef0>,code=200,effective_url='http://www.baidu.com',error=None,headers=<tornado.httputil.HTTPHeaders object at 0x7f2fdaa425d0>,reason='OK',request=<tornado.httpclient.HTTPRequest object at 0x7f2fdaa42250>,request_time=0.014312028884887695,time_info={})
  3. HTTPResponse(_body=None,buffer=<_io.BytesIO object at 0x7f2fdaa21ef0>,code=200,effective_url='http://www.baidu.com',error=None,headers=<tornado.httputil.HTTPHeaders object at 0x7f2fdaa43450>,reason='OK',request=<tornado.httpclient.HTTPRequest object at 0x7f2fdaa430d0>,request_time=0.02327895164489746,time_info={})
  4. HTTPResponse(_body=None,buffer=<_io.BytesIO object at 0x7f2fdaa21ef0>,code=200,effective_url='http://www.baidu.com',error=None,headers=<tornado.httputil.HTTPHeaders object at 0x7f2fdaa43510>,reason='OK',request=<tornado.httpclient.HTTPRequest object at 0x7f2fdaa43190>,request_time=0.026951074600219727,time_info={})
  5. HTTPResponse(_body=None,buffer=<_io.BytesIO object at 0x7f2fdaa21ef0>,code=200,effective_url='http://www.baidu.com',error=None,headers=<tornado.httputil.HTTPHeaders object at 0x7f2fdaa42690>,reason='OK',request=<tornado.httpclient.HTTPRequest object at 0x7f2fdaa42310>,request_time=0.0552978515625,time_info={})
  6. HTTPResponse(_body=None,buffer=<_io.BytesIO object at 0x7f2fdaa24ef0>,code=200,effective_url='http://www.baidu.com',error=None,headers=<tornado.httputil.HTTPHeaders object at 0x7f2fdaa39e10>,reason='OK',request=<tornado.httpclient.HTTPRequest object at 0x7f2fdaa39a90>,request_time=0.05612993240356445,time_info={})
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同样的情况也会出现在线程池跟协程的使用上，有谁知道这是怎么回事吗？

作者: 八戒你干嘛    时间: 2017-6-26 17:31
同问，等大神来解答



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