#14980: Runtime performance regression with binary operations on vectors -------------------------------------+------------------------------------- Reporter: ttylec | Owner: bgamari Type: bug | Status: new Priority: high | Milestone: 8.8.1 Component: Compiler | Version: 8.2.2 Resolution: | Keywords: vector | bitwise operations Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by ttylec): Indeed, sorry I didn't write earlier. But enabling profiling kills the performance boost. I suspect that the order-of-magnitude speedup is due to some really low level optimization. When the analogous code is run as a part of bigger code, the `unboxed vector` version scales across cores linearly up to 20 sth cores, while the `binary packed` does not scale linearly even with 2 cores. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14980#comment:16 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler