[GHC] #3518: GHC GC rises greatly on -N8 compared to -N7

[GHC]

#3518: GHC GC rises greatly on -N8 compared to -N7
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 Reporter:  nccb                      |          Owner:        
     Type:  run-time performance bug  |         Status:  new   
 Priority:  normal                    |      Milestone:        
Component:  Runtime System            |        Version:  6.10.4
 Severity:  normal                    |     Resolution:        
 Keywords:                            |       Testcase:        
       Os:  Linux                     |   Architecture:  x86   
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Comment (by NeilMitchell):

 I've seen this too. At -N8 some extra parallelism kicks in with the
 garbage collector, which destroys everything. The parallel GC in 6.12 is
 far better, so this issue will be obsolete then.

 Until then, I always pass {{{-N8 -g1}}} which turns off parallel GC and
 makes everything much faster again.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3518#comment:1>
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