#12274: GHC panic: simplifier ticks exhausted -------------------------------------+------------------------------------- Reporter: mrkkrp | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Compile-time | (amd64) performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by thomie): * failure: Compile-time crash => Compile-time performance bug Comment: Some notes: * There are a lot of `INLINE` pragmas in `Text.Mustache.Parser`, maybe too many? For example, removing the `INLINE` on `symbol` fixes the panic. * A `simpl-tick-factor` of `110` fixes the panic, so the simplifier is going only very slightly over the limit. This is probably nothing to worry about. * The regression in compile time is the real problem. Fixing it will fix the panic as well. I reduced it to the following testcase: https://github.com/thomie/megaslow (no external dependencies). Instructions: {{{ $ ghc -O Char.hs $ ghc -O -c -Rghc-timing Test.hs }}} ||= GHC =||= Bytes allocated for `Test.hs` =|| || 7.8.4 || 117MB || || 7.10.3 || 750MB || || HEAD (ffe4660510a7ba4adce846f316db455ccd91142a) || 724MB || -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12274#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler