[GHC] #9315: Weird change in allocation numbers of T9203

[GHC]

#9315: Weird change in allocation numbers of T9203
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              Reporter:  nomeata     |             Owner:  simonmar
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:
             Component:  Runtime     |           Version:  7.9
  System                             |          Keywords:
            Resolution:              |  Operating System:  Unknown/Multiple
Differential Revisions:              |   Type of failure:  None/Unknown
          Architecture:              |         Test Case:
  Unknown/Multiple                   |          Blocking:
            Difficulty:  Unknown     |
            Blocked By:              |
       Related Tickets:              |
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Comment (by simonmar):

 If we change validate to use GhcLibHcOpts=-O2 and update the tests to
 match, then

  * validate takes a minute longer
  * the tests now fail with a `quick` build (which we recommend for
 development, and I generally use)
  * the compiler is still not built with -O2

 So I'm not convinced this is a win.

 BTW, on the question of -j setting, the usual way is to say `CPUS=8
 ./validate` if you have an 8-core machine.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9315#comment:20>
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