[GHC] #7850: Strangely high memory usage on optimized Ackermann function

[GHC]

#7850: Strangely high memory usage on optimized Ackermann function
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Reporter:  dolio                    |          Owner:                  
    Type:  bug                      |         Status:  new             
Priority:  normal                   |      Component:  Compiler        
 Version:  7.6.2                    |       Keywords:                  
      Os:  Linux                    |   Architecture:  Unknown/Multiple
 Failure:  Runtime performance bug  |      Blockedby:                  
Blocking:                           |        Related:                  
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Changes (by Artyom.Kazak):

  * architecture:  x86_64 (amd64) => Unknown/Multiple


Comment:

 This bug is reproducible on my laptop (Linux, x86).

 I was not able to run the optimised program with less than 64kb of heap,
 though (was getting `Heap exhausted` errors), but running it with
 `-M64000` resulted in fifteen minutes of freeze and this error message:

 {{{internal error: getMBlock: mmap: Operation not permitted}}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7850#comment:2>
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