#5642: Deriving Generic of a big type takes a long time and lots of space -------------------------------------+------------------------------------- Reporter: basvandijk | Owner: bgamari Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.3 Resolution: | Keywords: deriving- | perf, Generics Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: T5642 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): The profile compiling `Data400.hs` from the repo given in comment:33 looks like this, {{{ Wed Apr 27 23:26 2016 Time and Allocation Profiling Report (Final) ghc +RTS -hc -p -RTS -B/opt/exp/ghc/roots/profiled/lib/ghc-8.1.20160222 Data400.hs -fforce- recomp total time = 5.12 secs (5118 ticks @ 1000 us, 1 processor) total alloc = 7,708,824,224 bytes (excludes profiling overheads) COST CENTRE MODULE %time %alloc canEvVar TcCanonical 41.0 45.8 zonkTopDecls TcRnDriver 17.4 25.3 CorePrep HscMain 6.4 7.5 SimplTopBinds SimplCore 5.9 2.6 CoreTidy HscMain 5.5 5.6 Simplify SimplCore 4.2 0.0 deSugar HscMain 3.6 1.7 tc_rn_src_decls TcRnDriver 3.2 2.9 solve_loop TcInteract 2.5 0.7 OccAnal SimplCore 1.6 0.2 pprNativeCode AsmCodeGen 1.1 1.3 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/5642#comment:34 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler