#12367: Commit adding instances to GHC.Generics regression compiler performance -------------------------------------+------------------------------------- Reporter: bgamari | Owner: bgamari Type: bug | Status: new Priority: normal | Milestone: 8.0.2 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: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- @@ -4,1 +4,1 @@ - compile time) by about 10%. + compile time) by between 0 and 20% (on average about 5%). New description: Recently 673efccb3b348e9daf23d9e65460691bbea8586e added a number of new instances for types defined in `GHC.Generics`. Unfortunately, it seems that this has regressed nofib compilation allocations (and also, it seems, compile time) by between 0 and 20% (on average about 5%). -- Comment (by bgamari): ||= Test name =||= Absolute change =||= relative change =|| || compile-allocs/MyList || 20238384 || 0.208624775040415 || || compile-allocs/MyList || 20281496 || 0.206217801180845 || || compile-allocs/Prog || 20334192 || 0.202959317331712 || || compile-allocs/Prog || 20344656 || 0.20053198007393 || || compile-allocs/Basics || 22115840 || 0.185615422473695 || || compile-allocs/Basics || 22149816 || 0.183089910175923 || || compile-allocs/Assemble_loadvec || 20347184 || 0.166966893079396 || || compile-allocs/Digraph || 21606168 || 0.166243308385695 || || compile-allocs/Assemble_loadvec || 20357600 || 0.165346296105217 || || compile-allocs/Shows || 20296024 || 0.165204453781781 || || compile-allocs/Digraph || 21659944 || 0.165084805640568 || || compile-allocs/Shows || 20338616 || 0.163719820616552 || || compile-allocs/Tol_cal || 20737568 || 0.161829271665394 || || compile-allocs/Queue || 20579112 || 0.161181557853612 || || compile-allocs/Tol_cal || 20731568 || 0.160175008827888 || || compile-allocs/Queue || 20600368 || 0.159599282181737 || || compile-allocs/Vtslib || 20374904 || 0.155144898631996 || || compile-allocs/Match || 20975896 || 0.154183839207216 || || compile-allocs/Vtslib || 20368168 || 0.153618623974637 || || compile-allocs/Match || 21000088 || 0.152948131340001 || || compile-allocs/Preds || 20369168 || 0.150245373920468 || || compile-allocs/Preds || 20382840 || 0.14899133906394 || || compile-allocs/BinConv || 21814376 || 0.147565217236013 || || compile-allocs/BinConv || 21843560 || 0.146507544982022 || || compile-allocs/Shapes || 20121512 || 0.144706659929922 || -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12367#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler