[GHC] #10289: compiling huge HashSet hogs memory

[GHC]

#10289: compiling huge HashSet hogs memory
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        Reporter:  zudov             |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Linux             |            Architecture:  x86_64
 Type of failure:  Runtime           |  (amd64)
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by zudov):

 I've just tried to run the build, and it still runs OOM. I guess travis
 just doesn't have enough memory.

 https://travis-ci.org/zudov/html5-entity/jobs/69424559#L519

 Replying to [comment:4 thoughtpolice]:
 > After looking back at my tests, the situation should be significantly
 better with GHC 7.10.2 based on my quick examination; the resident memory
 usage for me at least looks to be closer to 2GB on my machine. However,
 the total build time seems to be worse (1m52s to compile `EntrySet` at
 `-O2` vs your Travis machines ~30 seconds, but only a maximum residency of
 2GB).
 >
 > So there's still more to be done here, but enabling -O2 shouldn't
 cripple you anymore at least.
 >
 > Would you mind giving this a go with the latest `ghc-7.10` branch (or
 the 7.10.2 RC, which will be out soon?) You can use Herbert's PPA in
 combination with travis to get automated testing.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10289#comment:5>
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