#9669: Long compile time/high memory usage for modules with many deriving clauses -------------------------------------+------------------------------------- Reporter: snoyberg | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 (amd64) Type of failure: Compile- | Difficulty: Unknown time performance bug | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by simonpj): One thing that would help woul dbe if someone could characterise where the time is going. Build a profiled compiler (`GhcProfiled=YES` in your `build.mk`) and do some of the above tests. Using `-dshow-passes` also is good at showing if there is a big size blow- up anywhere. My fear is that these deriving clauses simply generate a lot of code, and that (naturally) takes a long time to compile. My hope is that there is a "big eater" somewhere that we can kill. But we need more information, and would appreciate help in getting it. Thanks Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9669#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler