#7602: Threaded RTS performing badly on recent OS X (10.8?) -------------------------------+-------------------------------------------- Reporter: simonmar | Owner: thoughtpolice Type: bug | Status: new Priority: normal | Milestone: _|_ Component: Runtime System | Version: 7.7 Keywords: | Os: MacOS X Architecture: x86_64 (amd64) | Failure: None/Unknown Difficulty: Unknown | Testcase: Blockedby: 7678 | Blocking: Related: | -------------------------------+-------------------------------------------- Comment(by thoughtpolice): OK. Clang is kind of being an issue at the moment so my patch is on hold (see #7678.) Right now my change is localized in ```GCTDecl.h``` behind an ```#ifdef``` so it's nothing more than a configurable performance optimization on Darwin. I think first I will just look at the raw differences between: * clang, with the slow, non-inline pthread calls. * clang, using this change to steal an inline TLS variable * gcc 4.7.2, using register variables. (I don't particularly care about llvm-gcc too much - it's already slow whether or not it's using clang or llvm-gcc, and llvm-gcc will be removed anyway.) Afterwords, we can look at what storing the TLS variable in a local will save us performance wise, and decide on a default. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7602#comment:17 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler