This isn't in any way a complete answer, but from within your project directory, you can use `stack exec -- ghc` to compile individual main modules, and play around with different profiling settings. My guess here is that -prof-auto it inserting cost centers in such a way that GHC isn't able to inline things, but that's very much a guess.
On Mon, Nov 28, 2016 at 12:48 AM John Ky <newho...@gmail.com> wrote: > Hello everyone, > > I have this problem where enabling profiling using stack undoes stream > fusion and I’d like to do my profiling with stream fusion intact. > > The following reproduces my problem: > > $ git clone g...@github.com:haskell-works/hw-tutorial-performance.git > $ cd hw-tutorial-performance/ > $ stack init > $ stack build --executable-profiling > $ time $(find .stack-work/dist/ -type f -name hw-tutorial-performance-rwhe) > 1e7 > 5000000.5 > > real 0m4.432s > user 0m3.484s > sys 0m0.936s > > $ rm -rf .stack-work/ > $ stack build > $ time $(find .stack-work/dist/ -type f -name hw-tutorial-performance-rwhe) > 1e7 > 5000000.5 > > real 0m0.034s > user 0m0.018s > sys 0m0.013s > > With profiling, my program taks over 4 seconds to run. Without profiling, > it only takes 0.034 seconds. > > I believe the problem to be that stream fusion has been disabled by stack. > > Does anyone know how to prevent this from happening? > > Cheers, > > -John > > > -- > You received this message because you are subscribed to the Google Groups > "haskell-stack" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to haskell-stack+unsubscr...@googlegroups.com. > To post to this group, send email to haskell-stack@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/haskell-stack/238e95ac-d9f9-4569-88a3-eedd5ab9b2a8%40googlegroups.com > <https://groups.google.com/d/msgid/haskell-stack/238e95ac-d9f9-4569-88a3-eedd5ab9b2a8%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "haskell-stack" group. To unsubscribe from this group and stop receiving emails from it, send an email to haskell-stack+unsubscr...@googlegroups.com. To post to this group, send email to haskell-stack@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/haskell-stack/CAKA2JgKENUw%3DxcRsX9FZWo%3D%2BJ0DPhZ9yDEcOo8e2-pCjfNJJbg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
