[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:  thoughtpolice
            Type:  bug             |           Status:  new
        Priority:  highest         |        Milestone:  7.8.1
       Component:  Runtime System  |          Version:  7.7
      Resolution:                  |         Keywords:
Operating System:  MacOS X         |     Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown    |       Difficulty:  Unknown
       Test Case:                  |       Blocked By:  7678
        Blocking:                  |  Related Tickets:
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Comment (by simonmar):

 If somebody makes a patch to pass around `gct` explicitly, and it doesn't
 degrade performance on Linux, then I wouldn't object to putting it in.  It
 would be good to remove our reliance on thread-local state, at the expense
 of a bit of extra code cruft.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7602#comment:30>
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