How to run celery on windows?
There are two workarounds to make Celery 4 work on Windows:
- use eventlet, gevent or solo concurrency pool (if your tasks as I/O and not CPU-bound)
- set the environment variable FORKED_BY_MULTIPROCESSING=1 (this is what actually causes the underlying billiard package to to fail under Windows since version 4)
See https://www.distributedpython.com/2018/08/21/celery-4-windows for more details
yes:
celery -A your_application -l info
also note Celery have dropped support for Windows(since v4), so best to
pip install celery==3.1.25
3.1.25 was the last version that works on windows(just tested on my win10 machine). Didn't need to downgrade flower(browser monitor for celery) though.
See also the FAQ for Windows
Compile Celery with --pool=solo argument.
Example:
celery -A your-application worker -l info --pool=solo
Celery 4.0+ does not officially support window already. But it still works on window for some development/test purpose.
Use eventlet instead as below:
pip install eventlet
celery -A <module> worker -l info -P eventlet
It works for me on window 10 + celery 4.1 + python 3.
This solution solved the following exception:
[2017-11-16 21:19:46,938: ERROR/MainProcess] Task handler raised error: ValueError('need more than 0 values to unpack',)
Traceback (most recent call last):
File "c:\users\wchen8\work\venv\weinsta\lib\site-packages\billiard\pool.py", line 358, in workloop
result = (True, prepare_result(fun(*args, **kwargs)))
File "c:\users\wchen8\work\venv\weinsta\lib\site-packages\celery\app\trace.py", line 525, in _fast_trace_task
tasks, accept, hostname = _loc
ValueError: need more than 0 values to unpack
===== update 2018-11 =====
Eventlet has an issue on subprocess.CalledProcessError:
https://github.com/celery/celery/issues/4063
https://github.com/eventlet/eventlet/issues/357
https://github.com/eventlet/eventlet/issues/413
So try gevent instead.
pip install gevent
celery -A <module> worker -l info -P gevent
This works for me on window 10 + celery 4.2 + python 3.6