#13535: vector test suite uses excessive memory on GHC 8.2 -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: bgamari Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #10800 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): Starting with `vector` 1d208ee9e3a252941ebd112e14e8cd5a982ac2bb, replace `tests/Test/Vector.hs` with the attached file. Compile using {{{ -no-link -fbuilding-cabal-package -static -dynamic-too -dynosuf dyn_o \ -dynhisuf dyn_hi -outputdir dist/build/vector-tests-O2/vector-tests-O2-tmp \ -odir dist/build/vector-tests-O2/vector-tests-O2-tmp -hidir \ dist/build/vector-tests-O2/vector-tests-O2-tmp -stubdir \ dist/build/vector-tests-O2/vector-tests-O2-tmp -i \ -idist/build/vector-tests-O2/vector-tests-O2-tmp -itests \ -idist/build/autogen -Idist/build/autogen \ -Idist/build/vector-tests-O2/vector-tests-O2-tmp \ -optP-include -optPdist/build/autogen/cabal_macros.h -hide-all-packages \ -package-db dist/package.conf.inplace -package HUnit-1.6.0.0 \ -package QuickCheck-2.9.2 -package base -package random-1.1 -package \ template-haskell -package test-framework-0.8.1.1 -package \ test-framework-hunit-0.3.0.2 -package test-framework-quickcheck2-0.3.0.3 \ -package transformers-0.5.2.0 -package vector-0.12.0.1 -XHaskell2010 \ -XCPP -XScopedTypeVariables -XPatternGuards -XMultiParamTypeClasses \ -XFlexibleContexts -XRank2Types -XTypeSynonymInstances -XTypeFamilies \ -XTemplateHaskell tests/Tests/Vector.hs -O2 -fno-warn-orphans \ -fno-warn-missing-signatures -Rghc-timing -v -ddump-simpl -ddump-to-file }}} In the below, the "offending patch" is 1c4a39d3a8d36803382792ff78b4709794358883 and "recent HEAD" is 7097f94df0c6667be2343306ffcda152fa22abcf. Allocations: 1. Before the offending patch: 13,445,819,064 2. After the offending patch: 135,653,550,528 (10x worse) 3. Recent HEAD: 71,354,312,480 (~5x worse) Tidy core size (terms) 1. Before offending: 20,934 2. After offending: 170,128 3. Recent HEAD: 170,023 Maximum reported core size (terms) before Tidy Core: 1. Before offending: 45,213 2. After offending: 1,358,264 3. Recent HEAD: 503,803 So we are clearly generating ''far'' more code, and while we eliminate a lot of it, we're still left with an awful lot. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13535#comment:32 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler