#7429: Unexplained performance boost with +RTS -h
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Reporter: simonmar | Owner:
Type: bug | Status: closed
Priority: normal | Milestone: 7.8.1
Component: Compiler | Version: 7.6.1
Resolution: wontfix | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: Runtime performance bug | Difficulty: Unknown
Testcase: | Blockedby:
Blocking: | Related:
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Comment(by simonmar):
The laziness here is in the contents of the `STRef`, where you can't put a
bang pattern. Now the problem is that because you're creating a circular
list, there must be at least ''one'' lazy element in it, because you're
using laziness to create the circularity. So you could probably add one
bang pattern in `twoItemList`, but not two (I haven't tried this).
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7429#comment:11>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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