#14870: Runtime performance regression in 8.4 -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Runtime Unknown/Multiple | performance bug Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- varosi [[https://mail.haskell.org/pipermail/glasgow-haskell- users/2018-February/026701.html|reports]] that the code for his project is slower in 8.4.1 than 8.2.2:

Yesterday I successfully compiled it with GHC 8.4.1-rc1. I got compiled it with 8.2.2 and 8.0.2 as well and ran tests for about a minute each on my Intel Core i7 machine on Windows 10 x64.

I got this results:

GHC 8.4.1-rc1 Average time: 61.87s

GHC 8.2.2 Average time: 60.09s

GHC 8.0.2 Average time: 67.07s

We should look into why. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14870 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler