#14254: The Binary instance for TypeRep smells a bit expensive -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: (none) Type: bug | Status: patch Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.2.1 Resolution: | Keywords: Typeable Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D3998 Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): I think you need to define what your cost model is; it's not clear that anyone expects `dynApply` to be as cheap as a static application. The same goes for serialisation; it's going to be expensive even if you cache the kind. This is why packages like `distributed-process` go to some lengths to avoid serialising unnecessarily. On the other hand, packages like `vault` really don't care how expensive kind computation is, so optimizing for this case may be counterproductive from their perspective. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14254#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler