does gevent create thread automatically?

[Fei Li]

I use gevent in single thread under uWSGI. The code is below.

def fetch_dataA():

    return gevent_clientA.fetch()

def fetch_dataB():

    return gevent_clientB.fetch()

def fetch_dataC():

    return gevent_clientC.fetch()

def views(request):

gs = []

for f in (fetch_dataA, fetch_dataB, fetch_dataC):

   g = gevent.spawn(f)

   gs.append(g)

gevent.join_all(gs, timeout=2.5)

for g in gs:

g.get()

return

I found uWSGI Python tracebacker output show a threadpool with 3 work threads was created. I don't think gevent create thread. I thought all greenlet will run under one single thread. So Does anybody tell me what's going on here?

uWSGI Python tracebacker output 

thread_id = <UnnamedPythonThread> filename = /usr/lib/python2.7/site-packages/gevent/threadpool.p

y lineno = 182 function = _worker line = task = task_queue.get()

thread_id = <UnnamedPythonThread> filename = /usr/lib/python2.7/site-packages/gevent/_threading.p

y lineno = 432 function = get line = self.not_empty.wait()

thread_id = <UnnamedPythonThread> filename = /usr/lib/python2.7/site-packages/gevent/_threading.p

y lineno = 148 function = wait line = waiter.acquire()

thread_id = <UnnamedPythonThread> filename = /usr/lib/python2.7/site-packages/gevent/threadpool.p

y lineno = 182 function = _worker line = task = task_queue.get()

thread_id = <UnnamedPythonThread> filename = /usr/lib/python2.7/site-packages/gevent/_threading.p

y lineno = 432 function = get line = self.not_empty.wait()

thread_id = <UnnamedPythonThread> filename = /usr/lib/python2.7/site-packages/gevent/_threading.p

y lineno = 148 function = wait line = waiter.acquire()

thread_id = MainThread filename = /usr/lib/python2.7/site-packages/gevent/hub.py lineno = 364 fun

ction = run line = loop.run()

thread_id = <UnnamedPythonThread> filename = /usr/lib/python2.7/site-packages/gevent/threadpool.p

y lineno = 182 function = _worker line = task = task_queue.get()

thread_id = <UnnamedPythonThread> filename = /usr/lib/python2.7/site-packages/gevent/_threading.p

y lineno = 432 function = get line = self.not_empty.wait()

thread_id = <UnnamedPythonThread> filename = /usr/lib/python2.7/site-packages/gevent/_threading.py lineno = 148 function = wait line = waiter.acquire()

 backtrace of 14706

[Fantix King]

It's probably that your gevent didn't build with c-ares correctly, which led gevent to use thread pool for name resolving.

BR,

Fantix

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http://about.me/fantix

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[Fei Li]

thank you.

[Fantix King]

不客气

BR,

Fantix

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http://about.me/fantix