[GHC] #4005: Bad behaviour in the generational GC with paraffins -O2 (was: paraffins: slowdown of ca 2 with -O2)

[GHC]

#4005: Bad behaviour in the generational GC with paraffins -O2
---------------------------------+------------------------------------------
    Reporter:  hwloidl           |       Owner:                                    
        Type:  bug               |      Status:  new                               
    Priority:  normal            |   Milestone:  _|_                               
   Component:  Runtime System    |     Version:  6.12.1 RC1                        
    Keywords:  optimisation      |          Os:  Unknown/Multiple                  
Architecture:  Unknown/Multiple  |     Failure:  Runtime performance bug           
  Difficulty:  Unknown           |    Testcase:  see attached (compile and run) log
   Blockedby:                    |    Blocking:                                    
     Related:                    |  
---------------------------------+------------------------------------------
Changes (by simonmar):

  * component:  Compiler => Runtime System
  * priority:  low => normal
  * difficulty:  => Unknown
  * architecture:  x86 => Unknown/Multiple
  * milestone:  7.4.1 => _|_
  * os:  Linux => Unknown/Multiple


Comment:

 We narrowed this down to a bad effect of generational GC.  There's no
 obvious fix, but the test case might come in handy if we implement some
 automatic tuning in the generational GC sometime, so I'm moving it to _|_.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4005#comment:14>
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