Re: [Haskell-cafe] pure Haskell database

On Wed, Sep 24, 2008 at 5:17 PM, Manlio Perillo wrote:

Hi.

I need a simple, concurrent safe, database, written in Haskell. A database with the interface of Data.Map would be great, since what I need to to is atomically increment some integer values, and I would like to avoid to use SQLite.

If that's the entire requirement, and you're looking for something really fast, perhaps you could use a shared-memory region between the processes (your keys would map to addresses in shared memory), and use a compare-and-set algorithm to handle the atomic increments. If you're on Intel/Itanium, I believe there's a CMPXCHG instruction that will do atomic compare-and-set on a memory address, and I'm not sure you could get much faster than that. :-) Graham