问题描述
我有一个 Bottle Web 应用程序运行一个很长的任务,为了赢得一些时间,我使用了多处理池。在 webapp 之外(所以只在我的 IDE 中运行代码)它看起来不错,从 54 秒到 14 秒。但是如果我在我的 webapp 上下文中运行我的多处理函数,它只显示 X 次(X 对应于我的池大小):
Bottle v0.12.18 server starting up (using WsgiRefServer())...
示例
main.py
from bottle import route,run
from functions import runFunction
@route('/')
def index():
runFunction()
return "<b>Hello</b>!"
run(host='localhost',port=8083,debug=False,reloader=True)
functions.py
import multiprocessing as mp
import time
import random
def longTask(x):
print(mp.current_process())
y = random.randint(1,5)
print(y)
time.sleep(y)
return x**x
def runFunction():
start_time = time.time()
pool = mp.Pool(3)
result = pool.map(longTask,[4,2,3,5,1,2])
print(result)
if __name__ == '__main__':
runFunction()
如果只在functions.py中运行main,输出为:
<SpawnProcess(SpawnPoolWorker-1,started daemon)>
1
<SpawnProcess(SpawnPoolWorker-3,started daemon)>
4
<SpawnProcess(SpawnPoolWorker-2,started daemon)>
2
<SpawnProcess(SpawnPoolWorker-1,started daemon)>
1
<SpawnProcess(SpawnPoolWorker-1,started daemon)>
2
<SpawnProcess(SpawnPoolWorker-2,started daemon)>
1
<SpawnProcess(SpawnPoolWorker-2,started daemon)>
2
[256,4,27,3125,4]
Process finished with exit code 0
如果您启动您的 Bottle 应用程序并继续访问 http://localhost:8083/,它将输出:
Bottle v0.12.18 server starting up (using WsgiRefServer())...
Listening on http://localhost:8083/
Hit Ctrl-C to quit.
Bottle v0.12.18 server starting up (using WsgiRefServer())...
Listening on http://localhost:8083/
Hit Ctrl-C to quit.
Bottle v0.12.18 server starting up (using WsgiRefServer())...
Listening on http://localhost:8083/
Hit Ctrl-C to quit.
我当然在多进程逻辑中遗漏了一些东西,但我找不到什么。知道发生了什么吗?
解决方法
main.py
文件在进程启动期间由 multiprocessing
导入,所有新进程通过调用 run(host=...
生成新的 Bottle 服务器。只需确保在导入文件时不执行 run
:
if __name__ == '__main__':
run(host='localhost',port=8083,debug=False,reloader=True)