defaultDbSettings slow to build in release mode

[ollef]

Changing this line:

folq :: DatabaseSettings be Folq
folq = defaultDbSettings

to

folq :: DatabaseSettings be Folq
folq = undefined

saves about 40 seconds of build time on my machine. Here Folq is a database with around 20 tables. If I build without optimisation (by passing --fast to Stack) it only saves about a second, which I can live with.

Is there any way to speed this up?

Cheers!

[ollef]

It seems likely that this is due to the general problem that GHC is slow at handling generics, and therefore that the problem is not Beam-specific. I had a look at the -ddump-simpl output from the definition, and it's got huge generic type representations in it, which perhaps points in that direction.

I would still be interested in hearing if there are any coping strategies, though.

[tathougies]

I've been experimenting with INLINEing which actually reduces the code by getting rid of some of the intermediate representations in the core. I'll have to run some benchmarks though.

[ollef]

Cool! Let me know if I can help test anything.