[GHC] #1969: enormous compile times

[GHC]

#1969: enormous compile times
-------------------------------------------------+-------------------------
        Reporter:  duncan                        |         Owner:  igloo
            Type:  bug                           |        Status:  closed
        Priority:  normal                        |     Milestone:  6.12
                                                 |  branch
       Component:  Compiler                      |       Version:  6.8.1
      Resolution:  fixed                         |      Keywords:
                                                 |  performance
Operating System:  Unknown/Multiple              |  Architecture:
                                                 |  Unknown/Multiple
 Type of failure:  Compile-time performance bug  |     Test Case:  T1969
-------------------------------------------------+-------------------------

Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"cc5ca21b6595d550b27439699cc223c7b0ceab61/ghc" cc5ca21/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="cc5ca21b6595d550b27439699cc223c7b0ceab61"
 Improved stats for Trac #1969

 With my latest commits

   76a5477 Move zonking out of tcFamTyPats
   b255ae7 Orient improvement constraints better

 perf has improved slightly for T1969:

 allocs:    733M -> 26M
 residency: 43M  -> 41M

 I don't know exactly why, but hey, it's good
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1969#comment:26>
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