#5631: Compilation slowdown from 7.0.x to 7.2.x
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Reporter: bjpop | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.2.1 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Compile-time performance bug
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Compile time performance for GHC appears to have slowed down significantly
for the package:
http://hackage.haskell.org/package/language-python
Time to compile the package:
- GHC 7.0.4: 3m57s
- GHC 7.2.1: 49m22s
- GHC 7.2.2: 49m56s
The culprits are the Happy generated modules:
Language.Python.Version3.Parser.Parser
Language.Python.Version2.Parser.Parser
GHC uses up to 700MB of memory compiling these files (my machine has 2GB
of RAM and it does not appear to be thrashing during the compilation).
All versions of GHC in this ticket were downloaded as binary packages from
the ghc website.
System:
OS X 10.7.2
1.4 GHz Intel Core 2 Duo
2GB RAM
GCC 4.2.1
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5631>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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