[GHC] #14594: 2 modules / 2500LOC takes nearly 3 minutes to build

[GHC]

#14594: 2 modules / 2500LOC takes nearly 3 minutes to build
-------------------------------------+-------------------------------------
        Reporter:  schyler           |                Owner:  dfeuer
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by schyler):

 On a desktop (Intel i5-3470 which is 3.2-3.6ghz, 8gb RAM):


 {{{
 resolver: lts-9.18

 real    1m55.157s
 user    0m0.000s
 sys     0m0.015s
 }}}


 {{{
 resolver: lts-10.0

 real    1m19.322s
 user    0m0.000s
 sys     0m0.015s
 }}}

 A concrete example where lts-10 is considerably faster (nearly 50%)! Well
 done everyone!

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14594#comment:10>
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