GHC build time graphs

[Karel Gardas]

On 02/12/16 09:02 PM, Reid Barton wrote:
>     btw, just recent experience on ARM64 (X-gene board):
>
>     bootstrapping 7.10.1 with 7.6.x took: ~120 minutes
>     bootstrapping 8.0.1 RC2 with 7.10.1 took: ~446 minutes
>
>     both run as: ./configure; time make -j8
>
>
> It would be interesting to have the time for bootstrapping 7.10.1 with
> 7.10.1 too, for comparison.

boostrapping 7.10.1 with 7.10.1 took: ~212 minutes -- but this is not 
comparable directly with numbers above since for whatever reason haddock 
and doc is not build although I've used previous ./configure; time make -j8.

Anyway, parallel make itself is not good to use here since the build 
process may also contain some noise of paralellel make fixes and such.

I think more reliable benchmark may be simple build (single-threaded) of 
ghc-cabal here. I'll see what I can do about that.

Cheers,
Karel