#8095: TypeFamilies painfully slow -------------------------------------+------------------------------------- Reporter: MikeIzbicki | Owner: Type: bug | Status: new Priority: high | Milestone: 7.12.1 Component: Compiler (Type | Version: 7.6.3 checker) | Keywords: Resolution: | Architecture: Operating System: Unknown/Multiple | Unknown/Multiple Type of failure: Compile-time | Test Case: performance bug | Blocking: Blocked By: | Differential Revisions: Related Tickets: 5321 | -------------------------------------+------------------------------------- Comment (by archblob): These are times measured on an i3-2100 CPU @ 3.10GHz running Ubuntu 15.04 and GHC 7.10.1 : ||= input =||= real =|| ||200 a a || 0m0.609s || ||300 a a || 0m0.689s || ||400 a a || 0m0.884s || ||500 a a || 0m0.942s || ||200 b a || 0m2.028s || ||200 c a || 0m1.092s || ||10000 a d || 0m1.978s || They are grately improved and needed no stack adjustment. Tail-recursive variant is still a lot slower. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8095#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler