#3796: GHC 6.12 dependency checking many times slower than 6.10
-------------------------------------------+--------------------------------
Reporter: sunrayser | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.12.1
Resolution: | Keywords:
Difficulty: | Os: Linux
Testcase: | Architecture: x86
Failure: Compile-time performance bug |
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Changes (by igloo):
* difficulty: =>
Old description:
> 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.
New description:
Get feldspar-language-0.1 from hackage and build it:
http://hackage.haskell.org/package/feldspar-language
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#comment:1>
GHC <http://www.haskell.org/ghc/>
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