Hello Mike, I cannot reproduce using GHC HEAD (though it seems to hang on GHC 7.0.3), so my guess is the bug has been fixed.
cvs-ghc, any guesses which patch this might have been? Cheers, Edward Excerpts from mike frai's message of Sat Apr 30 14:50:17 -0400 2011: > Hi, > > While using Michael Snoyman's persistent package, I discovered that a > certain bit of code generated from it made the GHC optimizer consume a > ridiculous amount of memory (ie. only when using the "-O" flag). I > know very little about the GHC compiler and Michael Snoyman > recommended I post my findings here to see what others thought. > > I've done what I can to extract the code generated from the persistent > package and simplify/strip it down to the bare minimum of what's > needed to cause this issue. You can find it in the attachment > FromTest.hs. From my testing, removing five fields from Rec and the > equivalent from the fromValue function - the memory consumption drops > dramatically and I am able to compile. > > For your convenience, I've also attached FromTest.out, which is the > output I get when compiling FromTest.hs using "ghc -O -v3". This is > just the output up to the point it starts consuming a lot of memory. > I've never seen anything after this point because my system slows down > to a crawl (due to swapping) and I end up killing the process. > > Please let me know what you guys think or if you need any more > information about this. Thanks, > - Mike _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
