Manlio Perillo ha scritto:
Hi.
As with a previous post, I think I have found a possible memory problem
with the uvector package.
I have this data structure (for, again, my Netflix Prize project):
IntMap (UArr (Word16 :*: Word8))
[...]
Today I have rewritten my program to use `alter` and `snocU`:
append Nothing = Just $ singletonU (a :*: b)
append (Just u) = Just $ snocU u (a :*: b)
alter append k m
>
> [...]
>
Unfortunately I'm still not able to load the entire Netflix Prize
training data set, grouping ratings by customers, because my PC has only
2 GB of RAM.
The required memory is about 2 GB, but when the system start to swap, I
have to kill the program.
Just another small strictness hint:
append (Just u) = u `seq` Just $ snocU u (a :*: b)
and now memory usage is 955 MB.
Regards Manlio
_______________________________________________
Haskell-Cafe mailing list
Haskell-Cafe@haskell.org
http://www.haskell.org/mailman/listinfo/haskell-cafe
