[Haskell-cafe] Memory problems reading a IntMap from a binary file

[Ludger Steens]

Hi,

I have IntMap String with about 40,000 entries. After saving it to disk 
(via Data.Binary) the file is 3.5 Mb small. However if I load it and 
save it back again my program needs 180 MB memory. Is there anything I 
do wrong or does the map really need that much memory?

The (simple) program I wrote:

main =
    do
    mp <- decodeFile "i.bin" :: IO ( IntMap String )
    encodeFile "i2.bin" mp
    exitWith ExitSuccess

Thanks,
Ludger