#14208: Performance with O0 is much better than the default or with -O2, runghc performs the best -------------------------------------+------------------------------------- Reporter: harendra | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by harendra): Thanks Matthew, that post is a good reference and it confirmed a few things I was guessing about. Some of this can perhaps go into the GHC manual. Mikolaj, there is no difference when the Monoid instance functions are also marked NOINLINE in addition to `toList`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14208#comment:20 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler