From: Chris Hecker <checker@d6.com>
To: William Chesters <williamc@paneris.org>, caml-list@inria.fr
Subject: Re: [Caml-list] OCaml Speed for Block Convolutions
Date: Wed, 06 Jun 2001 15:29:49 -0700 [thread overview]
Message-ID: <4.3.2.7.2.20010606152725.02a22310@shell16.ba.best.com> (raw)
In-Reply-To: <15134.36575.982859.678763@beertje.william.bogus>
>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
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next prev parent reply other threads:[~2001-06-06 22:27 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-06-04 13:25 David McClain
2001-06-04 19:51 ` William Chesters
2001-06-04 20:05 ` Chris Hecker
2001-06-04 20:15 ` David McClain
2001-06-04 22:34 ` Markus Mottl
2001-06-06 20:13 ` William Chesters
2001-06-06 22:29 ` Chris Hecker [this message]
2001-06-07 7:42 ` William Chesters
2001-06-05 7:22 ` Chris Hecker
2001-06-06 6:27 ` David McClain
2001-06-04 22:14 ` Tom _
2001-06-04 22:57 ` Chris Hecker
2001-06-05 2:52 ` Brian Rogoff
2001-06-05 15:02 ` Stefan Monnier
2001-06-05 10:48 ` Tom _
2001-06-06 2:03 ` Hugo Herbelin
2001-06-06 4:04 ` Charles Martin
2001-06-06 18:25 ` William Chesters
2001-06-06 18:35 ` William Chesters
2001-06-06 18:40 ` Patrick M Doane
2001-06-07 1:50 ` Hugo Herbelin
2001-06-07 18:20 ` Tom _
2001-06-07 23:49 ` [Caml-list] let mutable (was OCaml Speed for Block Convolutions) Jacques Garrigue
2001-06-08 0:20 ` [Caml-list] Currying in Ocaml Mark Wotton
2001-06-08 10:13 ` Anton Moscal
[not found] ` <Pine.LNX.4.21.0106081015000.1167-100000@hons.cs.usyd.edu.a u>
2001-06-08 0:38 ` Chris Hecker
2001-06-08 8:25 ` [Caml-list] let mutable (was OCaml Speed for Block Convolutions) Ohad Rodeh
2001-06-08 15:21 ` Brian Rogoff
2001-06-08 17:30 ` Pierre Weis
2001-06-08 18:36 ` Stefan Monnier
2001-06-08 19:07 ` Pierre Weis
2001-06-08 19:30 ` Michel Quercia
2001-06-11 6:42 ` [Caml-list] should "a.(i)" be a reference? (was "let mutable") Judicaël Courant
2001-06-11 13:42 ` [Caml-list] let mutable (was OCaml Speed for Block Convolutions) Pierre Weis
2001-06-12 3:21 ` Jacques Garrigue
2001-06-12 7:43 ` Pierre Weis
2001-06-12 8:31 ` Jacques Garrigue
2001-06-12 13:15 ` Georges Brun-Cottan
2001-06-12 21:54 ` John Max Skaller
2001-06-15 9:55 ` Michael Sperber [Mr. Preprocessor]
-- strict thread matches above, loose matches on Subject: below --
2001-06-01 18:38 [Caml-list] OCaml Speed for Block Convolutions David McClain
2001-06-01 22:51 ` Tom _
2001-06-02 0:10 ` Stefan Monnier
2001-06-04 10:12 ` Jacques Garrigue
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