#14727: Unboxed sum performance surprisingly poor -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.2.2 Resolution: | Keywords: UnboxedSums 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 osa1):
I'm not sure how much you're likely to get from a Criterion benchmark. Is there a specific thing you'd like me to try dumping?
I think looking at `lookup` in `benchmarks/IntMap.hs` (and any functions referenced by that function) would be helpful. I also think that it may be a good idea to add `{-# NOINLINE lookup #-}` in `benchmarks/IntMap.hs` just to avoid accidentally optimising the code at the use site (i.e. the benchmarking code). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14727#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler