I need to be able to run a number of background jobs simultaneously on Heroku. With Workless, DJ can automatically start and stop a single background worker task. I'm looking for something similar, but for a multiple task situation (e.g. scale up to a maximum of 100 or a 1000 workers, then shut them down as their jobs complete and there are no new jobs to run). Ideally, I'd like the tasks to give up the CPU when they become blocked (waiting for http or database access), but I'm not particularly concerned with each task getting an equal amount of the CPU (such as happens with threading). I know that there are tools like EventMachine, but as has been pointed out elsewhere, if you try writing anything other than a simple stateless application in EventMachine, the code ends up obscuring the function. Does anyone know of a library that will either convert DJ into a multi-tasking job scheduler, or alternatively, that supports the same sort of API (I mostly use "<object>.delay.<method-call>' to invoke background jobs) as DJ? Extra points if the package also supports local execution under Mac OS-X!
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