#9203: Perf regression in 7.8.2 relative to 7.6.3, possibly related to Typeable ------------------------------+-------------------------------------------- Reporter: simonmar | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.8.3 Component: Compiler | Version: 7.8.2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Runtime performance bug Unknown/Multiple | Test Case: Difficulty: Unknown | Blocking: Blocked By: | Related Tickets: | ------------------------------+-------------------------------------------- {{{ $ git clone http://github.com/facebook/Haxl.git Cloning into 'Haxl'... remote: Counting objects: 77, done. remote: Compressing objects: 100% (65/65), done. remote: Total 77 (delta 17), reused 69 (delta 9) Unpacking objects: 100% (77/77), done. $ cd Haxl $ ghc-7.6.3 -O2 tests/Bench.hs -main-is Bench -o tests/Bench-76 [1 of 6] Compiling Haxl.Core.StateStore ( Haxl/Core/StateStore.hs, Haxl/Core/StateStore.o ) [2 of 6] Compiling Haxl.Core.Show1 ( Haxl/Core/Show1.hs, Haxl/Core/Show1.o ) [3 of 6] Compiling Haxl.Core.Util ( Haxl/Core/Util.hs, Haxl/Core/Util.o ) [4 of 6] Compiling Haxl.Core.Types ( Haxl/Core/Types.hs, Haxl/Core/Types.o ) [5 of 6] Compiling Haxl.Core.DataCache ( Haxl/Core/DataCache.hs, Haxl/Core/DataCache.o ) [6 of 6] Compiling Bench ( tests/Bench.hs, tests/Bench.o ) Linking tests/Bench-76 ... $ ./tests/Bench-76 500000 Just (Right 0) insert: 0.87s 500000 lookup: 0.24s $ ./tests/Bench-76 500000 Just (Right 0) insert: 0.87s 500000 lookup: 0.26s $ ghc-7.8.2 -O2 tests/Bench.hs -main-is Bench -o tests/Bench-78 [1 of 5] Compiling Haxl.Core.StateStore ( Haxl/Core/StateStore.hs, Haxl/Core/StateStore.o ) [2 of 5] Compiling Haxl.Core.Show1 ( Haxl/Core/Show1.hs, Haxl/Core/Show1.o ) [3 of 5] Compiling Haxl.Core.Types ( Haxl/Core/Types.hs, Haxl/Core/Types.o ) [4 of 5] Compiling Haxl.Core.DataCache ( Haxl/Core/DataCache.hs, Haxl/Core/DataCache.o ) [5 of 5] Compiling Bench ( tests/Bench.hs, tests/Bench.o ) Linking tests/Bench-78 ... $ ./tests/Bench-78 500000 Just (Right 0) insert: 1.09s 500000 lookup: 0.44s $ ./tests/Bench-78 500000 Just (Right 0) insert: 1.08s 500000 lookup: 0.44s }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9203 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler