We use Celery for heavy computations (tile generation, and optionally assembling panoramas). To launch the celery workers, run:
celery -c 1 -A ztulec.celery worker --loglevel=info
Notice that we limit the number of worker to 1 (by default, celery launches as many workers as there are CPU cores). This because assembling panoramas is already multi-threaded and uses a lot of RAM, so there is no point in running multiple assembling in parallel.