#7556: build/fold causes with ByteString unpack causes huge memory leak ------------------------------------+--------------------------------------- Reporter: glguy | Owner: Type: bug | Status: new Priority: normal | Component: libraries/base Version: 7.6.1 | Keywords: Os: Unknown/Multiple | Architecture: Unknown/Multiple Failure: Runtime performance bug | Blockedby: Blocking: | Related: ------------------------------------+---------------------------------------
Comment(by glguy): {{{ module Main where import qualified Data.ByteString as B import Data.Word (Word8) -- works fast without optimizations -- with optimizations this has a space leak -- seems related to fold/build fusion in foldr/unpack main :: IO () main = do let b = B.replicate 100000000 1 print $ B.length b print $ example1 b -- fast print $ example2 b -- slow search :: [Word8] -> Bool search [] = False search (x:xs) = x == 1 || search xs example1, example2 :: B.ByteString -> Bool example1 = search . B.unpack example2 = foldr (\x xs -> x == 1 || xs) False . B.unpack }}} -- Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7556#comment:1> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler _______________________________________________ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs