Loading GHC into GHCi (and ghcid)

Simon Marlow marlowsd at gmail.com
Thu Jun 7 20:47:56 UTC 2018

For loading large amounts of code into GHCi, you want to add -j<n> +RTS
-A128m where <n> is the number of cores on your machine. We've found that
parallel compilation works really well in GHCi provided you use a nice
large allocation area for the GC. This dramatically speeds up working with
large numbers of modules in GHCi. (500 is small!)


On 30 May 2018 at 21:43, Matthew Pickering <matthewtpickering at gmail.com>

> Hi all,
> Csongor has informed me that he has worked out how to load GHC into
> GHCi which can then be used with ghcid for a more interactive
> development experience.
> 1. Put this .ghci file in compiler/
> https://gist.github.com/mpickering/73749e7783f40cc762fec171b879704c
> 2. Run "../inplace/bin/ghc-stage2 --interactive -odir tmp -hidir tmp"
> from inside compiler/
> It may take a while and require a little bit of memory but in the end
> all 500 or so modules will be loaded.
> It can also be used with ghcid.
> ghcid -c "../inplace/bin/ghc-stage2 --interactive -odir tmp -hidir tmp"
> Hopefully someone who has more RAM than I.
> Can anyone suggest the suitable place on the wiki for this information?
> Cheers,
> Matt
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