[Haskell-cafe] Parallel ghc --make

[Clark Gaebel]

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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