#15304: Huge increase of compile time and memory use from 8.0.2 to 8.2.2 or 8.4.2 -------------------------------------+------------------------------------- Reporter: NathanWaivio | Owner: (none) Type: bug | Status: new Priority: normal | 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 NathanWaivio): I have now been able to analyze the differences between ghc-8.0.2 to ghc-8.2.2. Here is a table of the growth of the number of terms per iteration of the Simplifier: ||= Simplifier Iteration =|| 1 || 2 || 3 || 4 || || ghc-8.0.2 || 118,835 || 138,330 || 172,291 || 516,767 || || ghc-8.2.2 || 149,046 || 185,066 || 15,190,006 || 12,310,166 || Apparently the largest difference occurs in Simplifier Iteration 3. What is going on with Simplifier Iteration 3? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15304#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler