[GHC] #13220: Performance regressions in testsuite from join points

[GHC]

#13220: Performance regressions in testsuite from join points
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        Reporter:  lukemaurer        |                Owner:  lukemaurer
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:  JoinPoints
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 Another data point: The total time it to finish the stage1 build (which
 does include some time spent not in ghc, like running configure scripts)
 increased from 1208s to 1272s when moving from `ghc-HEAD-before-join` to
 `ghc-HEAD-after-join` as the bootstrapping compiler, an increase of 5.3%.
 That's roughly consistent with the 6% increase in `DynFlags.hs` build time
 mentioned in the previous comment. Still not wonderful, but also not
 nearly as bad as the total build time regression would seem to indicate.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13220#comment:15>
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