Justin Presumably DeliveryManagementQueries uses TH to generate lots of glop? *** Desugar: Result size = 616,969 That's a big program! What kind of glop is it? Maybe it's the same kind of thing as one of these? http://hackage.haskell.org/trac/ghc/query?status=new&status=assigned&status=reopened&type=compile-time+performance+bug&order=priority Regardless, if you can make a reproducible test case that'd help us. Probably you can do this simply by generating a file with lots of repeated glop of the same kind as your TH is spitting out. Simon | -----Original Message----- | From: glasgow-haskell-users-bounces@haskell.org [mailto:glasgow-haskell-users- | bounces@haskell.org] On Behalf Of Justin Bailey | Sent: 24 July 2009 20:03 | To: glasgow-haskell-users@haskell.org | Subject: GHC 6.10.2 consuming lots of memory while compiling - help? | | 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? | | Justin