From: Lionel Elie Mamane <lionel@mamane.lu>
To: Stefan Monnier <monnier@iro.umontreal.ca>, caml-list@inria.fr
Subject: Re: [Caml-list] Re: OCaml runtime using too much memory in 64-bit Linux
Date: Wed, 14 Nov 2007 18:08:27 +0100 [thread overview]
Message-ID: <20071114170827.GA17569@capsaicin.mamane.lu> (raw)
In-Reply-To: <20071114164544.GB16398@capsaicin.mamane.lu>
On Wed, Nov 14, 2007 at 05:45:44PM +0100, Lionel Elie Mamane wrote:
> In particular, the addressing space of a 64 bit machine is, well... 64
> bits, by definition. For 4kiB = 2^12 B pages, one thus needs a table
> of size 2^(64-12) = 2^52 bytes, that is 4 EB. That is, on any machine
> with less than that of memory (and overcommit to 2), the program will
> not run. Even at one bit (and not byte) per page, that is still
> 16PB...
> Big pages don't get you out of the problem. 4MB pages only buy you a
> factor 1024, that is 4PB and 16GB.
I got my prefixes all wrong... It is 4PiB, 16TiB, 4TiB and 16GiB...
--
Lionel
next prev parent reply other threads:[~2007-11-14 17:08 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-07 17:28 Adam Chlipala
2007-11-07 18:20 ` [Caml-list] " Gerd Stolpmann
2007-11-07 19:12 ` Adam Chlipala
2007-11-08 12:56 ` Samuel Mimram
2007-11-14 4:20 ` Romain Beauxis
2007-11-14 12:03 ` Vladimir Shabanov
2007-11-14 12:55 ` Xavier Leroy
2007-11-14 13:45 ` Brian Hurt
2007-11-14 14:16 ` Romain Beauxis
2007-11-14 15:56 ` Markus Mottl
2007-11-14 16:22 ` Stefan Monnier
2007-11-14 16:36 ` [Caml-list] " Brian Hurt
2007-11-14 17:08 ` Lionel Elie Mamane
2007-11-14 17:26 ` Stefan Monnier
2007-11-14 16:45 ` Lionel Elie Mamane
2007-11-14 17:08 ` Lionel Elie Mamane [this message]
2007-11-08 20:51 ` [Caml-list] " Romain Beauxis
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