[wopwopwop]

I'm not an expert, but doesn't celery use multiple processes? I hope I'm not saying anything stupid, but I thought that's what "workers" were.

[staticautomatic]

Celery will typically use lightweight "threads" like greenlets or eventlets. I don't think it use multiple processes insofar as we're talking about python where process == core.

[brianwawok]

You can do greenlets or prefork concurrency. With prefork concurrency you get 1 process per fork. Gives you concurrency at the expense of a bit of memory.

[plantpark]

celery has a prefork pool that could take use of multiple processes.