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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