From: Stephan Houben <stephanh@planet.nl>
To: caml-list@yquem.inria.fr
Subject: Re: Threading and SharedMem (Re: [Caml-list] Re: Is OCaml fast?)
Date: Tue, 30 Nov 2010 09:10:36 +0100 [thread overview]
Message-ID: <4CF4B17C.7000703@planet.nl> (raw)
In-Reply-To: <fa.srfZThtnO8lApSpMeW3POD462Xg@ifi.uio.no>
On 11/29/2010 04:33 PM, Oliver Bandel wrote:
> Zitat von "Gerd Stolpmann" <info@gerd-stolpmann.de>:
>
>> Am Montag, den 29.11.2010, 17:12 +0100 schrieb Oliver Bandel:
>>> Zitat von "Gerd Stolpmann" <info@gerd-stolpmann.de>:
>>>
>>> You use shared mem(?), but you link only to *.ml files,
>>> and I see no *.c there.
>>> How can this be done?
>>>
>>> At least not via the libs that are shipped with OCaml?!
Actually it can be done using the libs that ship with OCaml
(Unix and Bigarray), although it is not 100% POSIX :
let create_shared_genarray kind layout dims =
let fd = Unix.openfile "/dev/zero" [Unix.O_RDWR] 0
in let ar = Bigarray.Genarray.map_file fd kind layout true dims
in Unix.close fd; ar
The resulting bigarray object is shared among subsequent forks.
This relies on the fact that mmap-ing /dev/zero is equivalent
to an anonymous mmap.
http://en.wikipedia.org/wiki//dev/zero
Well, at least it works on Linux.
Stephan
next parent reply other threads:[~2010-11-30 8:10 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.sn187DUeFX1sJ62LL4s6SatUR/c@ifi.uio.no>
[not found] ` <fa.PTndTGw0Otg08P5/YMoxmRptrPs@ifi.uio.no>
[not found] ` <fa.0ulojaV8bXHHiRN+1r6S98RGEsw@ifi.uio.no>
[not found] ` <fa.gQ7B1GYcdbBVupZowIyW2+1E/b4@ifi.uio.no>
[not found] ` <fa.ludbTMBmN7YGqnEwsRPwOGCpjrA@ifi.uio.no>
[not found] ` <fa.srfZThtnO8lApSpMeW3POD462Xg@ifi.uio.no>
2010-11-30 8:10 ` Stephan Houben [this message]
2010-11-30 12:55 ` oliver
2010-11-30 13:06 ` Eray Ozkural
2010-11-30 21:13 ` Jon Harrop
2010-11-30 21:28 ` Christophe Raffalli
2010-11-30 14:09 ` Gerd Stolpmann
[not found] <fa.eehhGhbses+7RvDlflKpXQ8Uu34@ifi.uio.no>
[not found] ` <fa.UVXWB7NnPNJbhh0Cf2OLmzYx/bQ@ifi.uio.no>
[not found] ` <fa.uksiRZ6fYFia4X1fXQaWa8z4Kio@ifi.uio.no>
[not found] ` <fa.Zv2Wkh0+DJAuXcOzq+qABiYFTP4@ifi.uio.no>
[not found] ` <fa.W5DnVSXs073N1X2rbtpyh7iGAcc@ifi.uio.no>
[not found] ` <fa.LGfjfIGKcYLW6PBxy7aMsEnvy/w@ifi.uio.no>
2010-11-30 15:30 ` Stephan Houben
2010-11-30 16:07 ` Gerd Stolpmann
2010-11-30 17:40 ` oliver
[not found] <fa.B9mcuN46iEGhXlge41VUCLz69+Y@ifi.uio.no>
[not found] ` <fa.D3cDWzaD9Uu03+KvekpwpBGCx7o@ifi.uio.no>
[not found] ` <fa.xsCCCeDYPj8J16i9UrdqxoOIQ0Y@ifi.uio.no>
[not found] ` <fa.SW2Swldk88Bs5ujaNHT8Yh4bXkg@ifi.uio.no>
[not found] ` <fa.V+M6RbukE/w/Aftpwxkx2MvkxlU@ifi.uio.no>
[not found] ` <fa.+OkqNL3AB4+5LA8wOnQD9WS59QQ@ifi.uio.no>
2010-11-30 14:04 ` Stephan Houben
2010-11-30 14:22 ` Gerd Stolpmann
2010-11-30 14:29 ` oliver
2010-11-30 15:17 ` Eray Ozkural
2010-11-22 17:08 [Caml-list] Is OCaml fast? David Rajchenbach-Teller
2010-11-23 2:01 ` Isaac Gouy
2010-11-23 23:27 ` [Caml-list] " oliver
2010-11-24 0:23 ` Isaac Gouy
2010-11-24 1:36 ` [Caml-list] " Eray Ozkural
2010-11-24 2:13 ` Isaac Gouy
2010-11-24 4:39 ` [Caml-list] " Jeff Meister
2010-11-25 16:59 ` Stefan Monnier
[not found] ` <1534555381.33107.1290723160355.JavaMail.root@zmbs4.inria.fr>
2010-11-25 22:50 ` [Caml-list] " Fabrice Le Fessant
2010-11-28 18:14 ` oliver
2010-11-29 14:19 ` Gerd Stolpmann
2010-11-29 16:12 ` Threading and SharedMem (Re: [Caml-list] Re: Is OCaml fast?) Oliver Bandel
2010-11-29 16:24 ` Gerd Stolpmann
2010-11-29 16:33 ` Oliver Bandel
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