#3796: GHC 6.12 dependency checking many times slower than 6.10
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Reporter: sunrayser | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.12.1 | Keywords:
Os: Linux | Testcase:
Architecture: x86 | Failure: Compile-time performance bug
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Get feldspar-language-0.1 from hackage and build it:
http://hackage.haskell.org/packages/archive/feldspar-language/0.1
/feldspar-language-0.1.tar.gz
Performance:
"cabal configure; cabal cuild; time cabal build"
6.12:
real 0m24.316s
user 0m24.063s
sys 0m0.159s
6.10:
real 0m2.252s
user 0m2.021s
sys 0m0.231s
"time cabal build" with 6.10 after "cabal build"-ing it with 6.12 (ie no
"rm -rf dist" before building with 6.10)
real 0m24.304s
user 0m24.094s
sys 0m0.139s
The last one is especially strange.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3796>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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