#11380: Compiling a 10.000 line file exhausts memory -------------------------------------+------------------------------------- Reporter: kennethb | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 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: | -------------------------------------+------------------------------------- Comment (by AndreasK): This regressed farther in 8.2.2 and 8.0.2 (at -O1) Compiling the project in GHC-8.2.2 takes forever (~10 Hours on an i7-6700). Ram usage for compile or ghci didn't go over 3GB in the first 10 Minutes but I stopped watching it afterwards. So the compile time of ~10h could have been a result of my machine running out of ram. With 7.10.3 compiling takes less than two Minutes. GHC-8.0.2 (stackage lts-9.20) probably has the same behaviour as 8.2.2 but I didn't wait around for it to finish. Using the same lts with ghc-7.10.3 works fine. Logs for build/ghci with 8.2.2: [https://github.com/AndreasPK/pyn/tree/f77f9454aa424545b2ce8bfb460d8d275edda9... repo for repro] {{{ Compiled (-O1) [17 of 20] Compiling Language.Python.Pyn.Parser.Parser ( .stack- work\dist\5c8418a7\build\Language\Python\Pyn\Parser\Parser.hs, .stack- work\dist\5c8418a7\build\Language\Python\Pyn\Parser\Parser.o ) *** Checking old interface for Language.Python.Pyn.Lexer (use -ddump-hi- diffs for more details): *** Deleting temp files: Deleting: compile: input file C:\Users\Andi\AppData\Local\Temp\ghc81932_0\ghc_7.hscpp *** Checking old interface for Language.Python.Pyn.Parser.Parser (use -ddump-hi-diffs for more details): *** Parser [Language.Python.Pyn.Parser.Parser]: !!! Parser [Language.Python.Pyn.Parser.Parser]: finished in 937.50 milliseconds, allocated 2647.317 megabytes *** Renamer/typechecker [Language.Python.Pyn.Parser.Parser]: !!! Renamer/typechecker [Language.Python.Pyn.Parser.Parser]: finished in 35763203.12 milliseconds, allocated 109977425.131 megabytes *** Desugar [Language.Python.Pyn.Parser.Parser]: Result size of Desugar (after optimization) = {terms: 83,551, types: 2,023,928, coercions: 76,061, joins: 1/136} Interpreter: [17 of 21] Compiling Language.Python.Pyn.Parser.Parser ( C:\test\pyn \.stack-work\dist\5c8418a7\build\Language\Python\Pyn\Parser\Parser.hs, interpreted ) *** Parser [Language.Python.Pyn.Parser.Parser]: !!! Parser [Language.Python.Pyn.Parser.Parser]: finished in 890.62 milliseconds, allocated 2646.366 megabytes *** Renamer/typechecker [Language.Python.Pyn.Parser.Parser]: !!! Renamer/typechecker [Language.Python.Pyn.Parser.Parser]: finished in 35747375.00 milliseconds, allocated 109978920.259 megabytes *** Desugar [Language.Python.Pyn.Parser.Parser]: Result size of Desugar (after optimization) = {terms: 217,920, types: 3,341,879, coercions: 76,475, joins: 0/653} }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11380#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler