#14378: Unreasonably high memory use when compiling with profiling and -O2/-O2 -------------------------------------+------------------------------------- Reporter: AndreasK | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 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: | -------------------------------------+------------------------------------- Description changed by AndreasK: Old description:

Based on [https://github.com/Daniel-Diaz/matrix/issues/43] I tried that myself.

* Without profiling: <10 sec, <110M Residency * Profiling and -O: 90sec, 1.5GB Residency * Profiling and -O2: Killed it after 4 Minutes and it started swapping on a 16GB Ram machine.

The invocation was: ghc Matrix.hs -prof -fprof-auto -c -fforce-recomp -O -v -fprof-auto-exported -caf-all -auto-all -fstatic-argument- transformation

Numbers above from 8.0.2.

8.2.1 improved to slightly worse than -O1 with ~95 sec and ~2.5GB ram usage. Still seems like a bug though.

I haven't tried HEAD yet.

New description: Based on [https://github.com/Daniel-Diaz/matrix/issues/43] I tried that myself. * Without profiling: <10 sec, <110M Residency * Profiling and -O: 90sec, 1.5GB Residency * Profiling and -O2: Killed it after 4 Minutes and it started swapping on a 16GB Ram machine. The invocation was: ghc Matrix.hs -prof -fprof-auto -c -fforce-recomp -O -v -fprof-auto-exported -caf-all -auto-all -fstatic-argument- transformation Numbers above from 8.0.2. Edit: I messed up the meassurement somehow. 8.2.1 improved to -O1 with ~70 sec and shy of 1GB ram usage. Not sure if that would still be considered a bug. -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14378#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#14378: Unreasonably high memory use when compiling with profiling and -O2/-O2 -------------------------------------+------------------------------------- Reporter: AndreasK | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Resolution: fixed | 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: | -------------------------------------+------------------------------------- Changes (by AndreasK): * status: new => closed * resolution: => fixed Comment: From feedback on IRC it seems the resources required on 8.2 for a profiling build are to be expected. As this doesn't seem to be a common issue and is fixed in 8.2 onwards I'm closing this as fixed. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14378#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler