#8095: TypeFamilies painfully slow -------------------------------------+------------------------------------- Reporter: MikeIzbicki | Owner: goldfire Type: bug | Status: new Priority: high | Milestone: 8.8.1 Component: Compiler (Type | Version: 7.6.3 checker) | Resolution: | Keywords: TypeFamilies Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #5321, #11598, | Differential Rev(s): Phab:D3752, #12506, #13386 | Phab:D4766 Wiki Page: | -------------------------------------+------------------------------------- Comment (by _recursion):
Because of that, GHC was taking **12gb+** to compile some files. I found that omitting the interfaces pragmas with `-fomit-interface-pragmas` was helping a lot. In fact, no more unfolded type in the interface file, making the dumped .txt file going from **3.5gb** to **700kb** with a maximum allocated memory of **2.5gb**.
Doing this has been an ''immense'' help for Luna. Compile times on my machine, which is no slouch, have gone from just over one hour to a hair over six minutes. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8095#comment:61> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler