[GHC] #9979: Performance regression GHC 7.8.4 to GHC HEAD

[GHC]

#9979: Performance regression GHC 7.8.4 to GHC HEAD
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        Reporter:  alanz             |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:  regression
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by simonpj):

 It would be helpful if someone felt able to characterise this more. For
 example:
  * Do the two invocations of `cabal install` compile exactly the same
 number of modules, each containing exactly the same code?
  * Which modules take longer to compile?  Or does everything take a little
 longer?

 Thanks

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9979#comment:1>
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