[GHC] #7602: Threaded RTS performing badly on recent OS X (10.8?)

[GHC]

#7602: Threaded RTS performing badly on recent OS X (10.8?)
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    Reporter:  simonmar          |       Owner:                  
        Type:  bug               |      Status:  new             
    Priority:  normal            |   Milestone:  _|_             
   Component:  Runtime System    |     Version:  7.6.1           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Comment(by thoughtpolice):

 Ah, I misspoke in earnest without looking more deeply. It does look like
 the ```callq  *(%rdi)``` is the indirection we're still hitting in some
 sense, although I'm not sure why it's different from apple's
 implementation in libc: with -O2, this is minimized to a simple load and
 call, but it's still a significant overhead for the access, at a glance.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7602#comment:5>
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