[asksol]

Celery can use async I/O too! Using the gevent pool you can have e.g. 4 celery worker instances with 1000 threads each.

[sciurus]

Right, but as you mention elsewhere in the thread there are caveats, like discussed at http://docs.celeryproject.org/en/latest/userguide/concurrenc... . At this point the blog post author's contention that celery is an better alternative to doing async i/o breaks down.