On 25/03/14 16:18, kyra wrote: > On 3/25/2014 19:11, Mateusz Kowalczyk wrote: >> That commit is not in 2.14.1. Do you have any benchmarks to show the >> speedup? If the commit does some significant speedup, I'm not against >> backporting it into Haddock released with 7.8.2 (and there is at least >> 1 other fix I want to get into 7.8.2) but we pretty much closed the >> 2.14.1, it's up on Hackage and everything and that's what's planned to >> ship with 7.8.1. > > Hmm, now, when I'm trying to reproduce things I don't see haddock > producing any assembly output let alone split it when using 7.8rc2 haddock. > > It seemed to me some time ago haddock became slow when processing a > package built with --enable-split-objs and I've decided to look into > things and discovered haddock wants .hi interface files and produces > assembly output to produce these interface files. > > I was extremely surprised, rechecked things several times and saw the > same picture. > > Now I can't reproduce this at all. > > If haddock never produced .hi interface files and/or assembly output > then that was some mental aberration and the whole story can be dropped. > > Regards, > Kyra > > > _______________________________________________ > ghc-devs mailing list > ghc-devs@haskell.org > http://www.haskell.org/mailman/listinfo/ghc-devs >
As far as I know (and this is mostly guessing), Haddock will ask GHC to produce .hi files when they do not already exist. I think you might have some luck if you simply try cabal configure && cabal haddock but I don't know. I took the patch because I saw no harm in it and all tests were passing but I do admit that I did not check the performance gain (we don't have benchmarks, perhaps we should hook some up) or loss. I think GHC has some Haddock perf tests but I did not check the numbers and I don't think it would even fall under that. If you can come up with something then let me know. If you can't, I think we'll keep the patch just in case unless someone can show it breaks something. The only instances of Haddock becoming really slow that I can think of is some rather old ticket (#101 on Haddock Trac) in presence of Template Haskell but I have closed it a while ago due to lack of information to go on and inability to replicate without the reporter's help. Perhaps this was your use case? -- Mateusz K. _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs
