Re: [GHC] #9332: Memory blowing up for strict sum/strict foldl in ghci

20 Jul 2014

      #9332: Memory blowing up for strict sum/strict foldl in ghci
-------------------------------------+-------------------------------------
              Reporter:              |             Owner:
  artella.coding                     |            Status:  closed
                  Type:  bug         |         Milestone:  7.8.4
              Priority:  high        |           Version:  7.8.3
             Component:  GHCi        |          Keywords:  ghci, strict,
            Resolution:  fixed       |  memory
Differential Revisions:              |  Operating System:  Linux
          Architecture:  x86_64      |   Type of failure:  Runtime
  (amd64)                            |  performance bug
            Difficulty:  Unknown     |         Test Case:
            Blocked By:              |          Blocking:
       Related Tickets:              |
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Comment (by artella.coding):

 If I modify the code above to the following, it blows up and this time
 using the methods above '''do not''' help :

 {{{
 --Sort.hs
 module Sort (result) where
 import Data.List

 longList::[Int]
 longList = [1 .. ]

 result :: Int
 result = foldl' (+) 0 $ takeWhile (< 10000000) longList
 }}}

 {{{
 --Main.hs
 module Main (main)  where
 import Sort (result)

 main = do
   print $ result
 }}}

 Then running with :

 {{{
 ghci -fobject-code Main.hs
 }}}

 results in memory blowing up.

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9332#comment:10
GHC http://www.haskell.org/ghc/
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