[GHC] #750: Set -M value based on available virtual memory

[GHC]

#750: Set -M value based on available virtual memory
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    Reporter:  simonmar        |        Owner:             
        Type:  task            |       Status:  new        
    Priority:  normal          |    Milestone:  6.6        
   Component:  Runtime System  |      Version:  6.4.1      
    Severity:  normal          |     Keywords:             
          Os:  Unknown         |   Difficulty:  Easy (1 hr)
Architecture:  Unknown         |  
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From John Meacham:

   perhaps if -M is not otherwise set, {{{getrlimit(RLIMIT_AS,..)}}} could
 be
   called and the maximum heap size set to just under that, since it is the
   point that the OS will forcefully kill the program anyway.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/750>
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