[GHC] #13059: High memory usage during compilation

[GHC]

#13059: High memory usage during compilation
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           Reporter:  domenkozar     |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.2-rc2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:  x86_64         |   Type of failure:  Compile-time
  (amd64)                            |  performance bug
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I'm building stack using GHC 8.0.2-rc2 and noticed store uses 5.17GB of
 (RSS) memory during
 https://github.com/fpco/store/blob/master/src/Data/Store/Internal.hs
 compilation step. Using GHC 8.0.1 memory goes up to only 1.6GB.

 I haven't dug deeper, but something suspicious is going on.

 You should be able to reproduce using installed Nix and executing nix-
 build -A haskell.packages.ghc802.store '<nixpkgs>' using recent channel.

 Building haddock for store also goes up to 5.8GB.

 It'd be great if someone is able to reproduce this using plan GHC
 8.0.2-rc2

 See also https://github.com/fpco/store/issues/91 for upstream bug report.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13059>
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