#15703: Significant compilation time blowup when refactoring singletons-heavy code -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.8.1 Component: Compiler | Version: 8.6.1 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 RyanGlScott): If you're wondering why I split the code up into two separate modules (instead of combining it into a single module), I observed that combining things into a single module actually made the compilation slowdown less severe (it took about 1 minute to compile, as opposed to the ~3m30s compile time shown above). I suspect that dividing up the code into further modules might exacerbate the compile times even more, since in the original project that I took this code from, it actually takes //longer// than 3m30s to compile the whole thing with `-O1`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15703#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler