[GHC] #10818: GHC 7.10.2 takes much longer to compile some packages

[GHC]

#10818: GHC 7.10.2 takes much longer to compile some packages
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        Reporter:  kazu-yamamoto     |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 Travis shows the time executed for each command at the right. So https
 ://travis-ci.org/jwaldmann/haskell-obdd/jobs/108860083#L233 shows `cabal
 build` taking ~150 seconds for example.

 Though I don't know how to reconcile that with the whole job taking "5 min
 16 sec", since the other times reported add up to less than a minute.

 I'm assuming Travis build machines are under huge load and memory
 pressure, and it's probably unreasonable to expect anything out of the
 build times beyond "if you make the build more efficient, the numbers will
 go down, probably".

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10818#comment:11>
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