#13739: Very slow linking of profiled executables -------------------------------------+------------------------------------- Reporter: duog | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1-rc2 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 RyanGlScott): Really, you don't even need profiled code to notice a difference. On my machine with `gcc-4.8.4`/`ld-2.24`, I experience longer linking times with an ordinary, non-profiled `main=return ()` executable: {{{ $ time /opt/ghc/8.0.2/bin/ghc -fforce-recomp -O0 Bug.hs [1 of 1] Compiling Main ( Bug.hs, Bug.o ) Linking Bug ... real 0m0.441s user 0m0.360s sys 0m0.060s $ time /opt/ghc/8.2.1/bin/ghc -fforce-recomp -O0 Bug.hs [1 of 1] Compiling Main ( Bug.hs, Bug.o ) Linking Bug ... real 0m1.616s user 0m1.476s sys 0m0.116s }}} On larger programs, the delay is more noticeable. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13739#comment:19 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler