#2438: memory performance problem when compiling lots of derived instances in a
single file
---------------------------------------------+------------------------------
Reporter: claus | Owner:
Type: compile-time performance bug | Status: new
Priority: normal | Component: Compiler
Version: 6.9 | Severity: normal
Keywords: | Testcase:
Architecture: Unknown | Os: Unknown
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I'm playing with deriving `Data/Typeable` for the GHC AST types (you'll
need a recent HEAD for the standalone deriving fixes #2378, and I've got
to use the generics-internal CPP tricks to work around #2433).
After getting the first compiler-complaint-free version of the instances
source, self-same compiler went away and tried to get all the memory it
could find (I had to kill the process). After splitting the source into
two, one importing the other, there is no problem loading them anymore.
- `Instances.hs` imports `Instances0.hs`: loading `Instances` into `GHCi,
version 6.9.20080709` works fine.
- `All.hs` merges the source of `Instances` and `Instances0` into a single
module: trying to load `All` into `GHCi, version 6.9.20080709` consumes
memory like crazy.
Compiling `All.hs` shouldn't behave like this in the first place, but if
just splitting the file into two helps, the compiler should be able to do
the split implicitly (sparing me the manual dependency analysis).
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2438>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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