Huge space leak of GHC API 7.8.x?

[Simon Peyton Jones]

Would you like to create a Trac ticket?

Is anyone able to investigate?

Simon

| -----Original Message-----
| From: ghc-devs [mailto:ghc-devs-bounces at haskell.org] On Behalf Of Kazu
| Yamamoto
| Sent: 14 July 2014 08:00
| To: ghc-devs at haskell.org
| Subject: Huge space leak of GHC API 7.8.x?
| 
| Hi,
| 
| Some guys reported to me that ghc-mod uses about 1G bytes on Mac and I
| can reproduce this. I tried to understand why ghc-mod uses such huge
| memory.
| 
| I found that GHC API 7.8.x uses much more memory than GHC API 7.6.x.
| Attached two files demonstrate this:
| 
| 	- A.hs -- Simple program using GHC API (copied from Wiki)
| 	- B.hs -- A target file, just hello world
| 
| You can compile A.hs as follows:
| 
| 	% ghc A.hs -package ghc -package ghc-paths
| 
| The following is the result:
| 
|             Mac (64bit)  Linux (64bit)
| GHC 7.6.3:         20MB            4MB
| GHC 7.8.3:        106MB           13MB
| 
| So, I think GHC API 7.8.x has huge space leak. (And I'm wondering why
| Mac uses much more memory than Linux).
| 
| I would like to hear opinions from you guys.
| 
| --Kazu
| 
| <A.hs>
| import Control.Concurrent
| import CoreMonad (liftIO)
| import DynFlags
| import GHC
| import GHC.Paths (libdir)
| 
| main = defaultErrorHandler defaultFatalMessager defaultFlushOut $ do
|     runGhc (Just libdir) $ do
|         dflags <- getSessionDynFlags
|         let dflags' = dflags {hscTarget = HscInterpreted
|                              ,ghcLink   = LinkInMemory
|                              ,ghcMode   = CompManager
|                              }
|         setSessionDynFlags dflags'
|         target <- guessTarget "B.hs" Nothing
|         setTargets [target]
|         load LoadAllTargets
|         liftIO $ threadDelay 10000000
| </A.hs>
| <B.hs>
| module B where
| 
| main = print "Hello, World!"
| </B.hs>
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