gevent.hub.LoopExit exeption, python threading and twisted reactor

[NPeganov]

Hi,

The short code snippet in the file attached
test1.txt

is hitting gevent.hub.LoopExit exeption immediately after running locust (even not spawn is started). Commenting out the line
Thread(target=reactor.run, args=(False,)).start()
resolves the issue. But I do need to use twisted and reactor.run must not block the code execution.

OS: ubuntu
The output is flooded with the following messages:
[2016-03-19 10:17:04,003] ip-172-20-38-27/INFO/locust.main: Starting web monitor at _:8089
[2016-03-19 10:17:04,003] ip-172-20-38-27/INFO/locust.main: Starting Locust 0.7.3
[2016-03-19 10:17:04,012] ip-172-20-38-27/ERROR/stderr: Unhandled Error
Traceback (most recent call last):
File "/usr/lib64/python2.7/threading.py", line 784, in __bootstrap
self.__bootstrap_inner()
File "/usr/lib64/python2.7/threading.py", line 811, in __bootstrap_inner
self.run()
File "/usr/lib64/python2.7/threading.py", line 764, in run
self.__target(_self.__args, **self.__kwargs)
File "/usr/lib64/python2.7/site-packages/twisted/internet/base.py", line 1194, in run
self.mainLoop()
--- ---
File "/usr/lib64/python2.7/site-packages/twisted/internet/base.py", line 1206, in mainLoop
self.doIteration(t)
File "/usr/lib64/python2.7/site-packages/twisted/internet/pollreactor.py", line 155, in doPoll
l = self._poller.poll(timeout)
File "/usr/lib64/python2.7/site-packages/gevent/select.py", line 127, in poll
result.event.wait(timeout=timeout)
File "/usr/lib64/python2.7/site-packages/gevent/event.py", line 213, in wait
return self._wait(timeout)
File "/usr/lib64/python2.7/site-packages/gevent/event.py", line 123, in _wait
gotit = self._wait_core(timeout)
File "/usr/lib64/python2.7/site-packages/gevent/event.py", line 101, in _wait_core
result = self.hub.switch()
File "/usr/lib64/python2.7/site-packages/gevent/hub.py", line 606, in switch
return greenlet.switch(self)
gevent.hub.LoopExit: ('This operation would block forever', <Hub at 0x277ed70 epoll pending=0 ref=0 fileno=5>)

[JunyongYao]

I met similar issue before and it was solved after monkey patching.

from gevent import monkey
monkey.patch_all()

And please place this code at the very beginning of your test code as gevent suggested.
Hope it is helpful for you.

[justiniso]

This should be resolved, but please reopen if you see this again.