[GHC] #7666: excessive space and time usage for rendering (somewhat) deeply nested Docs

[GHC]

#7666: excessive space and time usage for rendering (somewhat) deeply nested Docs
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Reporter:  j.waldmann        |          Owner:                  
    Type:  bug               |         Status:  new             
Priority:  normal            |      Component:  libraries/pretty
 Version:  7.6.2             |       Keywords:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown      |      Blockedby:                  
Blocking:                    |        Related:                  
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 I was running into serious performance problems when printing moderately
 sized Doc and Xml data (HaXml goes via Doc).

 Since pretty is shipped with ghc, this is potentially dangerous. Users
 will just assume that these core components are tried and tested, and
 working efficiently.

 More info:
 http://article.gmane.org/gmane.comp.lang.haskell.cafe/103210

 See also:
 http://stackoverflow.com/questions/9761507/which-pretty-print-library

 Test case (builds an Xml tree with HaXml and renders it via the pretty
 library):
 https://github.com/jwaldmann/haskell-tpdb/blob/master/test/speed.hs

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7666>
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