[GHC] #8732: Global big object heap allocator lock causes contention

[GHC]

#8732: Global big object heap allocator lock causes contention
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        Reporter:  tibbe                    |            Owner:  simonmar
            Type:  bug                      |           Status:  new
        Priority:  normal                   |        Milestone:  7.10.1
       Component:  Runtime System           |          Version:  7.6.3
      Resolution:                           |         Keywords:
Operating System:  Unknown/Multiple         |     Architecture:
 Type of failure:  Runtime performance bug  |  Unknown/Multiple
       Test Case:                           |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:
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Comment (by ezyang):

 In this case, slowness of TLS is not an issue, because we manually pass
 around pointers to structs which are known to be per-capability (and can
 be accessed in an unsynchronized way), so you don't actually need thread-
 local *state*.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8732#comment:8>
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