title: Celery: per task concurrency limits (# of workers per task)?
body: <p>Is it possible to set the concurrency (the number of simultaneous workers) on a per-task level in <a href="http://celeryproject.org/" rel="noreferrer">Celery</a>? I'm looking for something more fine-grained that <code>CELERYD_CONCURRENCY</code> (that sets the concurrency for the whole daemon).</p>
  
  <p>The usage scenario is: I have a single celerlyd running different types of tasks with very different performance characteristics - some are fast, some very slow. For some I'd like to do as many as I can as quickly as I can, for others I'd like to ensure only one instance is running at any time (ie. concurrency of 1).</p>