[GHC] #1136: High memory use when compiling many let bindings.

[GHC]

#1136: High memory use when compiling many let bindings.
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 Reporter:  igloo                         |          Owner:         
     Type:  compile-time performance bug  |         Status:  new    
 Priority:  high                          |      Milestone:  6.8.3  
Component:  Compiler                      |        Version:  6.6    
 Severity:  normal                        |     Resolution:         
 Keywords:  performance                   |     Difficulty:  Unknown
 Testcase:                                |   Architecture:  Unknown
       Os:  Unknown                       |  
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Comment (by igloo):

 J_mem_vs_time.png shows the memory use against time for J.hs, with
 different values of numa/numb. It doesn't look like there is a complexity
 problem, but the constant factor seems high, using about 10k per binding.
 J_heap_profile.png is the heap profile for the largest case (400/20000),
 and peak usage works out at about 5k per binding (the difference
 presumably being due to the copying GC). Typecheck-Rename stands out, but
 there are also a few other large space users.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1136#comment:7>
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