[GHC] #6110: Data.Vector.Unboxed performance regression of 7.4.1 relative to 7.0.4

[GHC]

#6110: Data.Vector.Unboxed performance regression of 7.4.1 relative to 7.0.4
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    Reporter:  mdgabriel                      |       Owner:  pcapriotti             
        Type:  bug                            |      Status:  infoneeded             
    Priority:  high                           |   Milestone:  7.4.3                  
   Component:  Compiler                       |     Version:  7.4.1                  
    Keywords:  Vector Performance Regression  |          Os:  Linux                  
Architecture:  x86                            |     Failure:  Runtime performance bug
  Difficulty:  Unknown                        |    Testcase:                         
   Blockedby:                                 |    Blocking:                         
     Related:  #6111                          |  
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Comment(by mdgabriel):

 @pcapriotti: I built a 7.4.1 from source with Data.Vector and obtained the
 same results.  I added some SCC manually but obtained no insights.  +RTS
 -t -RTS etc simply told me that all my time is mutator time. So, either

  1. Your version of 7.4.1 is compiled differently than mine, or
  2. Your environment is different from mine such that the difference
 manifests itself only with 7.4.1 and not 7.0.4.
  3. Something else?

 Is there some information you would wish that I have not given?

 - Marcus

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6110#comment:7>
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