#13426: compile-time memory-usage regression for DynFlags between GHC 8.0 and GHC 8.2 -------------------------------------+------------------------------------- Reporter: hvr | Owner: (none) Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D3399, Wiki Page: | Phab:D3400, Phab:D3421 -------------------------------------+------------------------------------- Comment (by bgamari): dfeuer will need to comment on what specifically "some cases" refers to, but the patch in comment:42 removes some `seq`s which don't appear to be necessary to prevent thunk leaks. I would expect that this did have a positive impact on compiler speed, but in practice this effect [[https://perf.haskell.org/ghc/#revision/2088d0be17dccfa91a4759bdbb20faae77c8dbed|appears]] to be too small to measure. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13426#comment:44 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler