Stratosphere takes too much RAM to compile

[jdreaver]

We are starting to hit the 4 GB limit of CircleCI on newer GHC versions. In particular, compiling the big Resources module is gnarly. I can think of a few options:

1. Pay for a larger build machine. We are on the Freckle github org, so maybe we can just use a larger build machine and it will go to our company bill?
2. Get rid of the big ResourceProperties sum type. We used to want that so FromJSON was easier, but I highly doubt anyone even uses FromJSON. Even so, we could just make ResourceProperties opaque and have each resource produce a ResourceProperties product type itself.
3. Split up stratosphere? If we do that, Resources.hs will still probably take a ton of RAM unless we do option 2. This option seems highly nontrivial.
4. Get rid of FromJSON entirely since I doubt anyone uses it. That might make a dent in RAM.

[utdemir]

Relevant: #95

[andreyk0]

We are bumping into this too a bit, option (2) sounds good!

[Znack]

If we get rid of FromJSON we can also consider to implement #80 in new ways :)

[jdreaver]

Yeah when I compile on my laptop, even with --fast, stack barely uses memory until we compile Stratosphere.Resources. Then we go above 4.5 GB. I'm leaning towards at removing FromJSON and the big resource sum type.

Thanks for the feedback everyone!

[jdreaver]

Fixed via #118 🎉

Simply removing FromJSON fixed everything. I didn't have to touch ResourceProperties at all (although I'm not a fan of that sum type even having to exist...).