From: Hugo Ferreira <hmf@inescporto.pt>
To: Martin Jambon <martin.jambon@ens-lyon.org>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Cache algorithms: implementation or library available?
Date: Wed, 23 Sep 2009 08:54:33 +0100 [thread overview]
Message-ID: <4AB9D439.4070304@inescporto.pt> (raw)
In-Reply-To: <4AB8B44F.6040503@ens-lyon.org>
Hi Martin,
Martin Jambon wrote:
> Hugo Ferreira wrote:
>> Hello,
>>
>> I would like to know if anyone has or knows of an Ocaml
>> library or open-source code implementation of some cache
>> algorithms (example: least recently used).
...
>
> There are so many possible access patterns and trade-offs:
>
> - speed requirements?
> - memory requirements?
> - constant size or just bounded?
> - is the probability of accessing an element a function of time?
>
I cannot say. It really depends on the convergence of the
algorithm which in turn depends on the data. I don't really
have enough information at this point to choose.
> I see two frequent use cases:
>
> a. some elements are accessed more frequently than others regardless of time
> b. recently-accessed elements have a higher probability of being accessed
>
I think (b) is the more appropriate one. As the algorithm converges so
does the probability of accessing a given key rise.
> Alain Frisch provides an implementation of roughly a hash table in which
> buckets hold only one element, which looks great at least for case (a):
>
> http://alain.frisch.fr/soft.html#memo
>
>
I've looked at the code ("tiny module" indeed).
May be of use to me. Don't like the use Obj.magic
and the Lazy module. Easy enough to adapt though.
Funny enough I was expecting complicated uses if the Weak module.
Thanks,
Hugo.
>
> Martin
>
next prev parent reply other threads:[~2009-09-23 7:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-22 10:29 Hugo Ferreira
2009-09-22 11:26 ` [Caml-list] " Martin Jambon
2009-09-23 7:54 ` Hugo Ferreira [this message]
2009-09-23 7:58 ` Hugo Ferreira
2009-09-23 15:09 ` Damien Doligez
2009-09-23 15:19 ` David McClain
2009-09-23 16:26 ` Mattias Engdegård
2009-09-24 13:14 ` Hugo Ferreira
2009-09-23 12:54 ` Gerd Stolpmann
2009-09-23 14:11 ` Jan Kybic
2009-09-23 15:02 ` Dario Teixeira
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