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

[GHC]

#7602: Threaded RTS performing badly on recent OS X (10.8?)
-------------------------------------+-------------------------------------
        Reporter:  simonmar          |            Owner:  thoughtpolice
            Type:  bug               |           Status:  new
        Priority:  highest           |        Milestone:  7.8.3
       Component:  Runtime System    |          Version:
      Resolution:                    |         Keywords:  thread-local
Operating System:  MacOS X           |  state, TLS clang
 Type of failure:  Runtime           |     Architecture:  x86_64 (amd64)
  performance bug                    |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:  7678
        Blocking:                    |  Related Tickets:
-------------------------------------+-------------------------------------

Comment (by simonmar):

 It looks like they're lacking good use cases for register variables.  I'm
 not on that list so it's difficult to jump into the middle of the
 conversation, perhaps someone else could point them to this ticket and/or
 our use of register variables in the GC?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7602#comment:41>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler