我可以在单个heroku（python）dyno中运行多个线程吗？

Question

在heroku上运行单个测试仪时，threading模块是否工作？ 如：

import threading 
import time 
import random 


def foo(x, s):  
    time.sleep(s) 
    print ("%s %s %s" % (threading.current_thread(), x, s)) 

for x in range(4): 
    threading.Thread(target=foo, args=(x, random.random())).start() 

应该返回类似...

$ python3 mythread.py 
<Thread(Thread-3, started 123145318068224)> 2 0.27166873449907303 
<Thread(Thread-4, started 123145323323392)> 3 0.5510182055055494 
<Thread(Thread-1, started 123145307557888)> 0 0.642366815814484 
<Thread(Thread-2, started 123145312813056)> 1 0.8985126103340428 

是吗？

Answer 1

是的。这很好=）刚刚在最新的Python 3版本上测试过。你可以很容易地在Heroku上自己测试它。

Heroku dynos正在使用虚拟CPU核心，但线程仍然正常工作。

编辑：这是我的Heroku记录

2016-08-02T20:18:35.040230+00:00 heroku[test.1]: State changed from starting to up 
2016-08-02T20:18:36.871061+00:00 app[test.1]: <Thread(Thread-3, started 140472762279680)> 2 0.10491314677740204 
2016-08-02T20:18:36.969173+00:00 app[test.1]: <Thread(Thread-1, started 140472795842304)> 0 0.2034461123977389 
2016-08-02T20:18:37.117934+00:00 app[test.1]: <Thread(Thread-2, started 140472779060992)> 1 0.35186381754517004 
2016-08-02T20:18:37.476239+00:00 app[test.1]: <Thread(Thread-4, started 140472542557952)> 3 0.7093646481085698