#8793: Improve GHC.Event.IntTable performance -------------------------------------+------------------------------------- Reporter: cdk | Owner: Type: task | Status: infoneeded Priority: normal | Milestone: 8.0.1 Component: Core Libraries | Version: 7.6.3 Resolution: | Keywords: 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 jscholl): I tried to collect the relevant changes from the patch, but in most cases could not reproduce the speedups cdk reported. Only for the {{{lookup}}} function the runtime changed measurable (it improved even more, around 78% faster than the current implementation). Pulling the {{{ForeignPtr}}} out of the {{{IORef}}} could make sense, but I could not measure an impact on performance. A thing I find surprising is the first argument in {{{updateWith.go}}}, which seems to be totally unused. Is this the correct behavior? Anyway, I created a second patch which removes the unused argument (and changes the first element of the return value to a {{{Bool}}}, as it is just tested for being {{{Nothing}}}), if it is just a leftover from an earlier version of the function. The change has no impact on performance, though. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8793#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler