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

[Don Stewart]

lutzsteens:
> 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?


String can be really expensive. Try an IntMap ByteString

> 
> The (simple) program I wrote:
> 
> main =
>    do
>    mp <- decodeFile "i.bin" :: IO ( IntMap String )
>    encodeFile "i2.bin" mp
>    exitWith ExitSuccess
> 
> Thanks,
> Ludger
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