#3972: ghc 6.12.1 and 6.13.20090922 consume a lot more memory than 6.10.4 when
compiling language-python package
-------------------------------+--------------------------------------------
Reporter: bjpop | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.12.1 | Keywords: memory usage
Os: Linux | Testcase:
http://projects.haskell.org/language-python/language-python-0.2.tar.gz
Architecture: x86_64 (amd64) | Failure: Compile-time performance bug
-------------------------------+--------------------------------------------
When compiling the language-python package ghc 6.12.1 and 6.13.20090922
consume a lot more memory than 6.10.4 does.
OS: x86_64 GNU/Linux, Ubuntu 9.10 karmic koala
gcc: 4.4.1
All versions of GHC taken from the generic binary downloads provided by
the GHC web page.
language-python: 0.2 (http://projects.haskell.org/language-python
/language-python-0.2.tar.gz)
cabal-install version 0.8.0
using version 1.8.0.2 of the Cabal library
Steps taken to witness bug:
1. wget http://projects.haskell.org/language-python/language-
python-0.2.tar.gz
2. tar xvf language-python-0.2.tar.gz
3. cd language-python-0.2/
4. cabal configure
5. cabal build
The build processes 10 files successfully before hitting
Language.Python.Common.ParserUtils. At that point memory consumption grows
to at least 1.5 GB resident, and I have to kill the process to prevent my
machine from thrashing.
Curiously ParserUtils is only a relatively small source file, 11975 bytes,
301 lines.
Turing off optimisation on the compilation of ParserUtils allows it to be
compiled very quickly without memory use explosion. But then the build
process gets to Language/Python/Version3/Parser/Parser.hs, and ghc
consumes lots of memory again (well past 1.5 GB).
This memory consumption behaviour has been independently verified by one
other user of language-python on ghc 6.12.1 on a different machine to
mine.
However, ghc 6.10.4 can successfully build the entire language-python
package in just under 1 GB of ram.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3972>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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