[GHC] #11666: Severe performance degradation in GHC 8.0.1 compared to GHC 7.10.x

[GHC]

#11666: Severe performance degradation in GHC 8.0.1 compared to GHC 7.10.x
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        Reporter:  mrkkrp            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1-rc2
      Resolution:                    |             Keywords:
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 mrkkrp):

 Replying to [comment:3 j.waldmann]:
 > don't put too much meaning into timings on travis.
 >
 > see this discussion https://mail.haskell.org/pipermail/haskell-
 cafe/2016-February/123260.html and data in ticket #10818
 >
 > put "-j2" in your build scripts.

 Well, that ticket is about compilation time and mine is about performance
 of
 compiled code, I don't see how `-j2` can help here.

 While there are many things that can influence timing on Travis, there
 results are quite reproducible and now (test suite has grown bigger) GHC
 7.10.x finishes successfully while 8.0.1 ends up with:

 > No output has been received in the last 10 minutes, this potentially
 > indicates a stalled build or something wrong with the build itself.

 This is really disappointing.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11666#comment:4>
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