[Haskell-cafe] Data.Judy and StablePtr
dsouza at bitforest.org
Tue Dec 21 09:29:11 CET 2010
Probably the solution would be recreating the FFI in a way that doesn't need
the StablePtr. Not sure how to do this though. I'm going to test other
things, like HashTable, before trying this. And let's see how it goes.
On Mon, Dec 20, 2010 at 2:40 PM, Gregory Collins <greg at gregorycollins.net>wrote:
> Pointers are mapped to StablePtrs using.... *drumroll* a hash table,
> so you can give up on getting acceptable performance out of this
> combination IMO.
> 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
> > 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
> > to improve the performance.
> > The second question is what is a common practice to avoid memory leaks
> > 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>
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