From: Pascal Obry <pascal@obry.net>
To: Norbert Caspari <nnc@gmx.li>
Subject: Re: question about tasks, multithreading and multi-cpu machines
Date: Tue, 14 Mar 2006 17:51:29 +0100
Date: 2006-03-14T17:51:30+01:00 [thread overview]
Message-ID: <4416F491.6080309@obry.net> (raw)
In-Reply-To: <dv6qsd$lg0$00$1@news.t-online.com>
Norbert Caspari a �crit :
> In Ada it is possible to declare multiple parallel running "tasks". But for
> my opinion the keyword "task" is somewhat misleding because in fact, those
> "tasks" are really threads.
Tasks are higher level than threads. For example it comes with
Rendez-vous. Tasks can indeed be implemented using threads on some OS.
It is the case for GNAT on GNU/Linux and Windows for example.
> If I run such a program on a multi-cpu machine, the process itself will use
> only one cpu, even though I create several "tasks".
Strange, threads should be properly scheduled by the OS to use multiple
CPU. Looks like an OS issue to me... Or a runtime issue, I don't
remember how tasking was implemented on HPUX on GNAT 3.15p.
> I tested this with gnat v3.15p under HPUX 11 on a multi-cpu server.
>
> How can I write my code to utilize all cpu's on such a machine? Is there a
> different way in Ada to perform multi-tasking instead of multi-threading?
Use Tasks.
> Thank you for your help!
You're welcome.
Pascal.
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next prev parent reply other threads:[~2006-03-14 16:51 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-14 16:26 question about tasks, multithreading and multi-cpu machines Norbert Caspari
2006-03-14 16:51 ` Pascal Obry [this message]
2006-03-16 4:27 ` Norbert Caspari
2006-03-16 10:04 ` Alex R. Mosteo
2006-03-14 17:18 ` Jean-Pierre Rosen
2006-03-16 4:22 ` Norbert Caspari
2006-03-16 6:58 ` Jean-Pierre Rosen
2006-03-14 18:49 ` Martin Krischik
2006-03-14 18:56 ` tmoran
2006-03-14 23:01 ` Jeffrey Creem
2006-03-15 1:15 ` Jeffrey R. Carter
2006-03-16 8:06 ` Maciej Sobczak
2006-03-16 10:23 ` Ole-Hjalmar Kristensen
2006-03-16 12:59 ` Dmitry A. Kazakov
2006-03-16 15:11 ` Larry Kilgallen
2006-03-16 15:50 ` Maciej Sobczak
2006-03-16 18:03 ` Jean-Pierre Rosen
2006-03-16 20:06 ` Dr. Adrian Wrigley
2006-03-17 3:26 ` Randy Brukardt
2006-03-16 20:06 ` Jeffrey R. Carter
2006-03-17 8:22 ` Maciej Sobczak
2006-03-17 11:36 ` Dmitry A. Kazakov
2006-03-17 14:23 ` Maciej Sobczak
2006-03-17 19:10 ` Dmitry A. Kazakov
2006-03-17 19:42 ` Jeffrey R. Carter
2006-03-18 0:27 ` tmoran
2006-03-25 21:28 ` Robert A Duff
[not found] ` <43gb22h4811ojjh308r2lqf5qqrujijjok@4ax.com>
2006-03-26 0:44 ` Robert A Duff
2006-03-15 6:46 ` Simon Wright
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