#15304: Huge increase of compile time and memory use from 8.0.2 to 8.2.2 or 8.4.2 -------------------------------------+------------------------------------- Reporter: NathanWaivio | Owner: tdammers Type: bug | Status: new Priority: high | Milestone: 8.6.1 Component: Compiler | Version: 8.4.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: x86_64 Type of failure: Compile-time | (amd64) performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by monoidal): Based on comment:6, I attached a bit smaller version without dependency on random. On my machine: * `ghc-8.0.2 -O -c Cl3.hs -fforce-recomp` takes 2 secs * `ghc-8.2.1 -O -c Cl3.hs -fforce-recomp` takes 57 secs * `ghc-8.4.3 -O -c Cl3.hs -fforce-recomp` takes 95 secs If I don't add `-O`, every version takes 2 secs. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15304#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler