It's also useful to note that the disk cache might do a surprisingly good job at caching those .hi files for you. That, and a lot of people (like me!) use SSDs, where the parallel compilation takes the vast majority of time. I'd be really excited to see parallel ghc --make. By the way, totally unrelated, but why does cabal support -j when cabal-dev doesn't? - Clark On Wednesday, May 15, 2013, Niklas Hambüchen wrote:
Hello Thomas,
thanks for your detailed answer.
Could be worthwhile re-evaluating the patch.
Does your patch still apply somewhat cleanly? And does it address all the caches in your list already or only some subset of them?
To have a multi-process ghc --make you don't need thread-safety. However, without sharing the caches -- in particular the interface file caches -- the time to read data from the disk may outweigh any advantages from parallel execution.
That might be a big step already - I've never seen a project where I'd care about parallel compilation that is not totally CPU-bound.
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