[GHC] #5773: main = forever (putStrLn =<< getLine) continuously saturates a CPU when compiled

[GHC]

#5773: main = forever (putStrLn =<< getLine)   continuously saturates a CPU when
compiled
-------------------------------+--------------------------------------------
    Reporter:  lpsmith         |       Owner:  simonmar               
        Type:  bug             |      Status:  new                    
    Priority:  highest         |   Milestone:  7.4.1                  
   Component:  Compiler        |     Version:  7.4.1-rc1              
    Keywords:                  |          Os:  Linux                  
Architecture:  x86_64 (amd64)  |     Failure:  Runtime performance bug
  Difficulty:  Unknown         |    Testcase:                         
   Blockedby:                  |    Blocking:                         
     Related:                  |  
-------------------------------+--------------------------------------------

Comment(by igloo):

 GHCi is linked with `-threaded` by default, which uses a different
 implementation of this stuff.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5773#comment:5>
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