[GHC] #8594: sysctl name "hw.ncpu" (HW_NCPU) is deprecated in Mac OS X

[GHC]

#8594: sysctl name "hw.ncpu" (HW_NCPU) is deprecated in Mac OS X
-----------------------------------+------------------------------------
        Reporter:  kseo            |            Owner:  simonmar
            Type:  task            |           Status:  new
        Priority:  normal          |        Milestone:
       Component:  Runtime System  |          Version:  7.6.3
      Resolution:                  |         Keywords:
Operating System:  MacOS X         |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown    |       Difficulty:  Unknown
       Test Case:                  |       Blocked By:
        Blocking:                  |  Related Tickets:
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Comment (by kseo):

 It seems hw.ncpu is equivalent to hw.logicalcpu.

 {{{
 kseo at com100ui-MacBook-Pro:~> sysctl hw.ncpu
 hw.ncpu: 4
 }}}

 {{{
 kseo at com100ui-MacBook-Pro:~> sysctl hw.logicalcpu
 hw.logicalcpu: 4
 }}}

 {{{
 kseo at com100ui-MacBook-Pro:~> sysctl hw.physicalcpu
 hw.physicalcpu: 2
 }}}

 Does GHC have a benchmark suite to measure the impact of this change? If
 not, we can fallback to hw.logicalcpu if hw.ncpu is not available. This at
 least preserves the current behavior.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8594#comment:2>
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