#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 mwu): The observation about stack behavior is interesting, I was curious to what degree it affects our builds. I have built and tested the stack's fork with binary interface support (many thanks to hussein.aitlahcen!) on our codebase ([https://github.com/luna/luna]). I have observed visible improvements both in build time (32 min vs 39 min) and memory usage (peaking at 12.3 GB instead of 14.2 GB) — however it is still very slow. With `-fomit-interface-pragmas` everything builds in little over 4 minutes but the binary performance is much worse. So I'm afraid GHC-side solution still remains very much needed. Is there still a chance that the fix will land in GHC 8.8? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8095#comment:64 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler