#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: simonpj
Type: bug | Status: new
Priority: high | Milestone: 6.12.3
Component: Compiler | Version: 6.12.1
Keywords: memory usage | Difficulty:
Os: Linux | Testcase:
http://projects.haskell.org/language-python/language-python-0.2.tar.gz
Architecture: x86_64 (amd64) | Failure: Compile-time performance bug
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Comment(by simonmar):
This workaround seems to do the trick. To the top of
`Language.Python.Common.AST`, add
{{{
{-# OPTIONS_GHC -fomit-interface-pragmas #-}
}}}
You might also want to add `-O0` option to each `Parser.y` file, but
without them GHC tops out at 1GB on a 64-bit machine.
The problem seems to be inlining of record selectors. I tried working
around it with NOINLINE pragmas on the instance Span methods, to no avail.
All the inlining machinery has had an overhaul in 6.14, so I don't imagine
we'll be investing time in a fix for this in the 6.12 branch unless it's
easy (I defer to Simon PJ on that one).
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3972#comment:9>
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