English version
Accueil     À propos     Téléchargement     Ressources     Contactez-nous    

Ce site est rarement mis à jour. Pour les informations les plus récentes, rendez-vous sur le nouveau site OCaml à l'adresse ocaml.org.

Browse thread
[Caml-list] OCaml Speed for Block Convolutions
[ Home ] [ Index: by date | by threads ]
[ Search: ]

[ Message by date: previous | next ] [ Message in thread: previous | next ] [ Thread: previous | next ]
Date: 2001-06-06 (22:27)
From: Chris Hecker <checker@d...>
Subject: Re: [Caml-list] OCaml Speed for Block Convolutions

>My feeling has always been that the overhead of initialising a float
>array, per element, is considerably less than the cost of one floating
>point operation; so if you ever intend to actually use the array for
>anything, the inefficiency is negligible.

This is not true on modern processors, if I understand what you're saying.  Touching memory that's not in the cache is orders of magnitude slower than flops.  Even the best case, with the memory in the cache, touching memory is the same speed or slower than doing a flop on most CPUs.

Chris


-------------------
To unsubscribe, mail caml-list-request@inria.fr.  Archives: http://caml.inria.fr