[GHC] #9646: Strange performance bug

[GHC]

#9646: Strange performance bug
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              Reporter:  erikd       |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Runtime     |       Blocked By:
  performance bug                    |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by dfeuer):

 I don't know what's going on, but I'm curious whether there might be some
 sort of interference from `make` or associated OS or CPU stuff. Have you
 tried running the benchmarks separately from the compilation process?
 Another thing to experiment with is reversing the order of the Criterion
 benchmarks to see if the slowness follows the position in the benchmark
 list.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9646#comment:2>
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