[GHC] #8096: Add fudge-factor for performance tests run on non-validate builds

[GHC]

#8096: Add fudge-factor for performance tests run on non-validate builds
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        Reporter:  ezyang            |                   Owner:
            Type:  task              |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Build System      |                 Version:  7.7
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  #9315             |  Differential Revisions:
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Changes (by thomie):

 * related:   => #9315


Comment:

 See ticket:9315#comment:24 for a proposal to only run performance tests
 when validating with release settings (-O2).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8096#comment:1>
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