I think Ancient is exactly what you're looking for.

Just disable swap (which you should do anyway on a big modern server), and it will let you keep in-memory, out-of-heap OCaml values that don't get scanned by the GC.

Anil

On 8 Dec 2011, at 08:19, William Le Ferrand wrote:

> hi Stephane
> 
> Yes, but it's not exactly what we're looking for : we plan to access the data at a (very) high rate, so swapping/unswapping would probably kill the performance .. 
> 
> 
> On Wed, Dec 7, 2011 at 10:04 PM, Stéphane Glondu <steph@glondu.net> wrote:
> Le 08/12/2011 05:35, William Le Ferrand a écrit :
> > We are building a cache in ocaml and we're wondering if it would make
> > sense to store ocaml values outside the reach of the gc. (gc on a 20GB
> > cache hangs the process for a second or so).
> 
> Have you heard of the ancient [1] library?
> 
> [1] http://git.annexia.org/?p=ocaml-ancient.git;a=summary
> 
> 
> Cheers,
> 
> --
> Stéphane
> 
> 
> 
> 
> -- 
> William Le Ferrand
> 
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>