#14880: GHC panic: updateRole -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: goldfire Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.2.2 checker) | Resolution: | Keywords: TypeInType Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: #15076 | Differential Rev(s): Phab:D4769 Wiki Page: | -------------------------------------+------------------------------------- Comment (by tdammers): Hah, that's a good hint! I did another run, this time compiling with `-fprof-auto-top` on `TyCoRep` only, and this reveals two interesting things: - `tcvs_of_type`, which doesn't exist in the old version yet, is responsible for 4.5% of CPU time in the new version - `zonkTopDecls`, while allocating about 8.8% in both versions, jumps from 5.9% CPU to 8.2% I'll dig deeper on these two. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14880#comment:42 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler