[Haskell-cafe] binary package: memory problem decoding an IntMap

Manlio Perillo manlio_perillo at libero.it
Sun Apr 5 16:41:57 EDT 2009

Manlio Perillo ha scritto:
> Hi.
> I'm having memory problems decoding a big IntMap.
> The data structure is:
> IntMap (UArr (Word16 :*: Word8))
> There are 480189 keys, and a total of 100480507 elements
> (Netflix Prize).
> The size of the encoded (and compressed) data is 184 MB.
> When I load data from the Netflix Prize data set, total memory usage is
> 1030 Mb.

It seems there is a problem with tuples, too.

I have a:
     [(Word16, UArr (Word32 :*:* Word8))]

This eats more memory than it should, since tuples are decoded lazily.


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