#13639: Skylighting package compilation is glacial -------------------------------------+------------------------------------- Reporter: bgamari | Owner: dfeuer Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): In a recent HEAD ( 4700baaf8f9bf3c44a53a595d840c7c14cfd6f98 ): The "nearly ten minutes" seems to be the "user" time in a parallel build, for which the real time is around 3 minutes. If cabal and GHC are each passed `-j1`, the user time drops to around five minutes. So one issue seems to be some inefficiency in parallel builds. Running single-threaded, I don't see any big difference between the time it takes to build the unprofiled and profiled versions (although of course building both takes about twice as long as building just the unprofiled). So I don't really think profiling has anything to do with the issue, at least for HEAD. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13639#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler