#8027: Adding one call to getNumCapabilities triggers performance nose dive (6X slowdown) --------------------------------------+------------------------------------- Reporter: rrnewton | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Runtime System | Version: 7.6.3 Resolution: wontfix | Keywords: Os: Unknown/Multiple | Architecture: Unknown/Multiple Failure: Runtime performance bug | Difficulty: Unknown Testcase: | Blockedby: Blocking: | Related: --------------------------------------+------------------------------------- Comment(by simonpj): I think you are saying that ''inlining a single function, not in an inner loop, has a 6x effect on runtime''. That seems very odd to me. The only examples I've seen with this kind of behaviour is are when a tight loop calls an overloaded arithmetic function; inlining it make it turn into a few machine instructions. But `getNumCapabilities` doesn't seem to be that kind of beast. So I'm still puzzled S -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/8027#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler