@mccraigmccraig: discovered ctx/with-context and pm/promise-context (from your bug report no less) and now I'm set.

Looks like I will be able to get away with a combination of p/all and m/alet (all allows its contained to run in parallel [at least when inside an alet]).

So, no need for fmap, fapply, join et al just yet at least.

Anyone who's following along and/or interested (e.g. @hugesandwich ) can see the final code here: http://stackoverflow.com/questions/35666407/how-to-parallelize-m-sequential-operations-over-n-objects-with-sync-point/35674674?noredirect=1#comment59040248_35674674 [Also open to suggestions for improvement].