#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): Wiki Page: | -------------------------------------+------------------------------------- Comment (by rwbarton): I bisected and found out that the offending commit was none other than 8d5cf8bf584fd4849917c29d82dcf46ee75dd035 "Join points". I didn't see this in my previous data because, ironically, `-dcore-lint` causes the large space usage to go away. So it seems likely to be a garden-variety thunk buildup in some field which is examined by core lint, but otherwise not examined until late in the compilation pipeline. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13426#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler