From: Christophe TROESTLER <Christophe.Troestler+ocaml@umh.ac.be>
To: burns.ethan@gmail.com
Cc: caml-list@yquem.inria.fr, ruml@cs.unh.edu
Subject: Re: [Caml-list] Question about float refs.
Date: Mon, 23 Aug 2010 14:06:26 +0200 (CEST) [thread overview]
Message-ID: <20100823.140626.634675953541672216.Christophe.Troestler+ocaml@umons.ac.be> (raw)
In-Reply-To: <AANLkTimsE3czb5OxWm4V+bGY_75oQKhBL7N709iS9Djt@mail.gmail.com>
On Thu, 19 Aug 2010 07:52:33 -0400, Ethan Burns wrote:
>
> let r = ref 0.0 ;;
> for i = 0 to 1000000000 do r := float i done;
> Printf.printf "%f\n" !r;
> Printf.printf "words: %f\n" (Gc.stat ()).Gc.minor_words
To add a precision to others' answers : float refs are unboxed
_locally_. If you rewrite your code as
let r = ref 0.0 in
for i = 0 to 1000_000_000 do r := float i done;
Printf.printf "%f\n" !r;
Printf.printf "words: %f\n" (Gc.stat ()).Gc.minor_words
then it runs at about the same speed as you other version.
My 0.02€,
C.
next prev parent reply other threads:[~2010-08-23 12:07 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-19 11:52 Ethan Burns
2010-08-19 13:14 ` [Caml-list] " Lukasz Stafiniak
2010-08-19 13:34 ` David House
2010-08-19 13:49 ` Till Varoquaux
2010-08-23 12:06 ` Christophe TROESTLER [this message]
2010-08-23 12:14 ` Ethan Burns
2010-08-23 12:42 ` Sylvain Le Gall
2010-08-23 13:00 ` [Caml-list] " Dmitry Bely
2010-08-31 19:41 ` Jon Harrop
2010-09-01 7:18 ` Dmitry Bely
2010-09-01 7:46 ` Christophe TROESTLER
2010-09-01 8:31 ` Fabrice Le Fessant
2010-09-01 9:54 ` Ethan Burns
2010-09-01 12:29 ` Fabrice Le Fessant
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