#13253: Exponential compilation time with RWST & ReaderT stack with `-02` -------------------------------------+------------------------------------- Reporter: phadej | Owner: bgamari, osa1 Type: bug | Status: new Priority: normal | Milestone: 8.8.1 Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #15630 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by tdammers): A quick test suggests that the patch from comment:24 makes things better, but not by the amount we would expect from actually solving the excessive inlining / Core blowup issue. On my machine, compilation time between GHC 8.4.2 and HEAD with the patch applied goes down from 2:00 minutes to 1:45 approximately; significantly faster, but not the orders-of-magnitude improvement we would expect from a proper fix. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13253#comment:36 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler