#8623: Strange slowness when using async library with FFI callbacks --------------------------------------------+------------------------------ Reporter: JohnWiegley | Owner: simonmar Type: bug | Status: new Priority: normal | Milestone: 7.8.1 Component: Runtime System | Version: 7.6.3 Resolution: | Keywords: Operating System: MacOS X | Architecture: Type of failure: Runtime performance bug | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Comment (by hvr): fwiw, I suspect some kind of lock contention issue, as the runtime goes down as soon as there's some delay involved (such as `putStr` or even using `threadDelay` which causes the thread to yield) as well as using more than one HEC via `+RTS -N2` -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8623#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler