如何使用 asyncio 减少 ProcessPoolExecutor 的 CPU 使用率？

用户11211747

我使用ProcessPoolExecutor如下

def main(argv):
    set_argv(argv)
    # running code. Loop button click, enter text, submit.
if __name__ == '__main__':
    executer = ProcessPoolExecutor(max_workers=9)
    argvs = ["D", "E", "F", "G", "H", "I", "J", "K", "L"]
    for argv in argvs:
        executer.submit(main,argv)

但是这段代码 100% 使用 CPU，并且每个进程只完成一个进程需要两倍的时间。

所以我想用它asyncio来降低CPU使用率。但下面的代码会产生错误。

async def async_set():
    coroutines = []
    argvs = ["D", "E", "F", "G", "H", "I", "J", "K", "L"]
    fts = [loop.run_in_executor(main(m)) for m in argvs]
    for f in asyncio.as_completed(fts, loop=loop):
        await f

async def main(argv):
    set_argv(argv)
    # running code. Loop button click, enter text, submit.

loop = asyncio.get_event_loop()
    loop.run_until_complete(async_set())
    loop.close()

错误是：

 fts = [loop.run_in_executor(main(m)) for m in argvs]
TypeError: run_in_executor() missing 1 required positional argument: 'func'

ㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡ

fts如下更改后

fts = [loop.run_in_executor(None, main, m) for m in argvs]

出现错误，但只有 1 个进程正常运行

Traceback (most recent call last):
  File "C:/Users/admin/Desktop/test/Version/test.py", line 593, in <module>
    loop.run_until_complete(async_set())
  File "C:\Python\Python37\lib\asyncio\base_events.py", line 584, in run_until_complete
    return future.result()
  File "C:/Users/admin/Desktop/test/Version/test.py", line 60, in async_set
    await f
  File "C:\Python\Python37\lib\asyncio\tasks.py", line 533, in _wait_for_one
    return f.result()  # May raise f.exception().
  File "C:\Python\Python37\lib\concurrent\futures\thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "C:/Users/admin/Desktop/test/Version/test.py", line 67, in main
    set_login(ID, PW)
  File "C:/Users/admin/Desktop/test/Version/test.py", line 188, in set_login
    driver.find_element_by_xpath('//*[@id="header"]/div/div[1]/ul[2]/li[1]/a').click()
  File "C:\Python\Python37\lib\site-packages\selenium\webdriver\remote\webelement.py", line 80, in click
    self._execute(Command.CLICK_ELEMENT)
  File "C:\Python\Python37\lib\site-packages\selenium\webdriver\remote\webelement.py", line 633, in _execute
    return self._parent.execute(command, params)
  File "C:\Python\Python37\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "C:\Python\Python37\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.StaleElementReferenceException: Message: stale element reference: element is not attached to the page document
  (Session info: chrome=73.0.3683.86)
  (Driver info: chromedriver=73.0.3683.68 (47787ec04b6e38e22703e856e101e840b65afe72),platform=Windows NT 10.0.17763 x86_64)

二战

我不知道这对你的过程有多好，但它运行：

import asyncio
import concurrent.futures

def main(argv):
    t = random.choice([.02,.1,.5,.3,1.0,2.0,3.0,5.,6.,7.,8.,9.])
    time.sleep(t)
    return (t, argv * 2)

async def async_set():
    loop = asyncio.get_event_loop()
##    coroutines = []
    argvs = ["D", "E", "F", "G", "H", "I", "J", "K", "L"]
    with concurrent.futures.ProcessPoolExecutor() as pool:
        stuff = [loop.run_in_executor(pool,main,arg) for arg in argvs]
        for fut in asyncio.as_completed(stuff):
            print(await fut)

if __name__ == '__main__':

    loop = asyncio.get_event_loop()
    loop.run_until_complete(async_set())
    loop.close()

>>>
(0.5, 'EE')
(0.5, 'DD')
(0.5, 'FF')
(7.0, 'HH')
(8.0, 'II')
(0.1, 'LL')
(9.0, 'GG')
(9.0, 'JJ')
(7.0, 'KK')
>>>

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