#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 tdammers): Steps to reproduce: 1. Check out from git: {{{#!bash git clone https://github.com/waivio/cl3.git; cd cl3 }}} 2. Install the `random` package (e.g. `cabal install random`) 3. {{{#!bash cd cl3 }}} 4. {{{#!bash ghc -c Algebra/Geometric/Cl3.hs -fforce-recomp -O2}}} Without `-O2`, things compile in under .1 seconds on my machine; adding `-O2` makes it take minutes. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15304#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler