[GHC] #15503: interpreter: sequence_ (replicate 100000000 (return ())) gobbles up memory

[GHC]

#15503: interpreter: sequence_ (replicate 100000000 (return ()))  gobbles up memory
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        Reporter:  int-e             |                Owner:  osa1
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.8.1
       Component:  GHCi              |              Version:  8.5
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by osa1):

 With Phab:D5351 we can run retainer profiler on ghci so I tried this with
 `ghci +RTS -hb` and used 50000000 as the input. I've attached the raw
 output and a .svg generated with hp2pretty. It's not too helpful: the
 `SYSTEM` retainer is retaining GBs of data but we don't have more details
 on what the retainer is.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15503#comment:14>
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