Hello, I was experimenting with using ghc-6.10.0.20081007 on a project, and it seems that binary-0.4.3.1 has markedly worse performance in certain cases. With the following simple test:
import qualified Data.ByteString.Lazy as L import Data.Binary import Data.Binary.Get import Control.Monad
main :: IO () main = do b <- L.readFile "some_binary_file" putStrLn $ show $ runGet getter b
getter :: Get [Word16] getter = replicateM 1000000 getWord16le
running this program compiled with ghc-6.10 takes about 4 times as long (and consumes much more memory) as when compiled with ghc-6.8.3. The extra time appears to be proportional to the number of elements processed in the Get. Running the programs with -hT shows a clear memory difference, which I think is the source of the problem. I've placed pdfs of that output at https://webspace.utexas.edu/latojw/data/ The difference seems to manifest itself only when the elements are actually processed; changing "show $ runGet " to "show $ length $ runGet " is slightly faster in 6.10. I was working on an Intel Mac with OS 10.4, binary-0.4.3.1, and bytestring-0.9.1.4. Can anyone confirm this, or suggest what might be the difference? Thank you, John Lato