[GHC] #3340: Better defaults for parallel GC settings

[GHC]

#3340: Better defaults for parallel GC settings
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  Reporter:  simonmar          |          Owner:  simonmar        
      Type:  task              |         Status:  new             
  Priority:  high              |      Milestone:  6.12.1          
 Component:  Runtime System    |        Version:  6.10.2          
  Severity:  normal            |       Keywords:                  
Difficulty:  Moderate (1 day)  |       Testcase:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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 The parallel GC settings should default to something sensible in 6.12.1.
 Check that we don't introduce any performance regressions with the default
 settings compared to 6.10.4.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3340>
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