#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 bgamari): Indeed something catastrophic is happening here; this can be plainly seen in the `+RTS -h` profiles I attached above. These were produced by building two GHC trees, one bootstrapping with 8.2 and another with 8.0.2, taking the `DynFlags` command line from the stage1 build, and adding `-fforce-recomp -v +RTS -h >log 2>&1` to it. Clearly we have a significant amount of leakage. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13426#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler