[Haskell-cafe] Data.Judy and StablePtr

[Gregory Collins]

Pointers are mapped to StablePtrs using.... *drumroll* a hash table,
so you can give up on getting acceptable performance out of this
combination IMO.

G

On Mon, Dec 20, 2010 at 5:06 PM, Diego Souza <dsouza at bitforest.org> wrote:
> Hello Haskellers,
> I'm playing a bit with Data.Judy. However, I noticed that using StablePtr
> incurs in some performance problems, I don't have any numbers but as a
> example use Int and ByteString as values and you can notice the difference
> without any benchmarking tool with the example that comes in the
> documentation.
> The question that I have is: is there any way to make it faster for types
> other than those that fits in word size? I understand that the way the
> binding to the C code has been done, stableptr is required. Am I wrong
> assuming this? I would be happy to submit a patch but I failed to find a way
> to improve the performance.
> The second question is what is a common practice to avoid memory leaks with
> StablePtr? I have zero experience programming with the Haskell FFI
> interface, so probably the most basic stuff would help me a lot in this
> case.
>
> Thanks in advance,
> --
> ~dsouza
> yahoo!im: paravinicius
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-- 
Gregory Collins <greg at gregorycollins.net>