for celery, run this:

celery -A celery_worker.celery worker --loglevel=INFO


on prod web server, celery is managed by systemd: /etc/default/celeryd and /etc/systemd/system/celeryd.service

sudo systemctl stop celeryd
sudo systemctl restart celeryd or sudo service celeryd restart

*** check for celery-related problems by looking in /var/log/celery ***

for profiling:
use
python profile_app.py
instead of
flask run