[GHC] #645: Make tick interval configurable

[GHC]

#645: Make tick interval configurable
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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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The hardwired tick interval of 0.02 seconds is too long.  We should make
 this shorter, and preferably configurable at runtime by an RTS option.

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Ticket URL: <http://cvs.haskell.org/trac/ghc/ticket/645>
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