ghc-parmake
ghc-parmake is a parallel wrapper for ghc --make intended to work as its
drop-in replacement. It can build your Haskell program in parallel using
multiple cores and will be integrated with cabal build eventually (though I
also plan to support the standalone version).
To use it with cabal, try cabal build --with-ghc=ghc-parmake --ghc-options="-j N".
ghc-parmake works by first extracting a module dependency graph with ghc -M
and then running multiple ghc -c processes in parallel. Currently, it can
build itself and some small test programs (see the tests directory).
To set the number of concurrent jobs, use the -j option.
Usage
ghc-parmake OPTS FILES
-j N - Run N jobs in parallel.
--ghc-path=PATH - Set the path to the ghc executable.
-vv[N] - Set verbosity to N (only for ghc-parmake).
N is 0-3, default 1.
-v[N] - Set verbosity to N (both for GHC and ghc-parmake itself).
--help - Print usage information.
-V - Print version information.
Other options are passed to GHC unmodified.
Known limitations
- Build fails when
-odir!=-hidir. - Tested only on Linux.