#9599: app runs 10 times faster when compiled with profilling information than without it -------------------------------------+------------------------------------- Reporter: kgardas | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Operating System: Solaris | Architecture: x86 Type of failure: Runtime | Difficulty: Unknown performance bug | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by rwbarton): The presence of SCC annotations can inhibit certain optimizations; perhaps one of those optimizations is in fact making your non-profiled program much slower. I'd try building it with `-fno-full-laziness` and/or `-fno- state-hack`. For that matter, what is the performance like of the two versions with optimizations turned off completely? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9599#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler