#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: --------------------------------------------+------------------------------ Description changed by hvr: Old description:
I've attached a Haskell and a C file, when compiled as such:
ghc -DSPEED_BUG=0 -threaded -O2 -main-is SpeedTest SpeedTest.hs SpeedTestC.c
You should find that with 7.4.2, 7.6.3 or a recent build of 7.8, building with SPEED_BUG=0 produces an executable that takes more than a second to run, while building with SPEED_BUG=1 runs very quickly. I've also attached the Core for both scenarios.
New description: I've attached a Haskell and a C file, when compiled as such: {{{ ghc -DSPEED_BUG=0 -threaded -O2 -main-is SpeedTest SpeedTest.hs SpeedTestC.c }}} You should find that with 7.4.2, 7.6.3 or a recent build of 7.8, building with `SPEED_BUG=0` produces an executable that takes more than a second to run, while building with `SPEED_BUG=1` runs very quickly. I've also attached the Core for both scenarios. -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8623#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler