jgbailey:
I apologize in advance for the vagueness of my report here - it's one of those situations I'm not sure how to cut it down to size yet.
I have a module that uses HaskellDB and Template Haskell together. The module itself depends on 23 other modules, each of which give a type definition for a particular database table or view. I only mention that to emphasize that the module depends on some "big" types (HList records w/ 20+ members) and on compile-time generated code.
My problem is this - when GHC compile the module, it consumes 1.2 GB of memory, takes about 10 minutes, and finally produces an object file. The memory usage seems related to template haskell, but I'm not positive.
I've attached verbose output from compiling the module in question. The command line I used was:
ghc -v --make -c DeliveryManagementQueries.hs -XEmptyDataDecls -XTypeSynonymInstances -XTemplateHa skell
Now for my question - please ignore the specifics of haskelldb/template haskell - any suggestions for figuring out what GHC is doing, besides tried-and-true divide and conquer?
Oh, and I note you're not using -O or -O2 either? -- Don