From: hugo rivera <uair00@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] threads vs forks
Date: Tue, 3 Mar 2009 16:33:30 +0100 [thread overview]
Message-ID: <138575260903030733y22df5705qd54d7d117d5628fa@mail.gmail.com> (raw)
In-Reply-To: <3e1162e60903030719v141b41e9ma5fd98c73d8b0e7c@mail.gmail.com>
thanks a lot guys.
I think I should study this issue in greater detail. It is not as easy
as I tought it would be.
2009/3/3, David Leimbach <leimy2k@gmail.com>:
>
>
> On Tue, Mar 3, 2009 at 3:52 AM, hugo rivera <uair00@gmail.com> wrote:
> > Hi,
> > this is not really a plan 9 question, but since you are the wisest
> > guys I know I am hoping that you can help me.
> > You see, I have to launch many tasks running in parallel (~5000) in a
> > cluster running linux. Each of the task performs some astronomical
> > calculations and I am not pretty sure if using fork is the best answer
> > here.
> > First of all, all the programming is done in python and c, and since
> > we are using os.fork() python facility I think that it is somehow
> > related to the underlying c fork (well, I really do not know much of
> > forks in linux, the few things I do know about forks and threads I got
> > them from Francisco Ballesteros' "Introduction to operating system
> > abstractions").
>
> My knowledge on this subject is about 8 or 9 years old, so
> check with your local Python guru....
>
> The last I'd heard about Python's threading is that it was cooperative only,
> and that you couldn't get real parallelism out of it. It serves as a means
> to organize your program in a concurrent manner.
>
> In other words no two threads run at the same time in Python, even if you're
> on a multi-core system, due to something they call a "Global Interpreter
> Lock".
>
> >
> > The point here is if I should use forks or threads to deal with the job at
> hand?
> > I heard that there are some problems if you fork too many processes (I
> > am not sure how many are too many) so I am thinking to use threads.
> > I know some basic differences between threads and forks, but I am not
> > aware of the details of the implementation (probably I will never be).
> > Finally, if this is a question that does not belong to the plan 9
> > mailing list, please let me know and I'll shut up.
> > Saludos
> >
>
> I think you need to understand the system limits, which is something you can
> look up for yourself. Also you should understand what kind of runtime model
> threads in the language you're using actually implements.
>
> Those rules basically apply to any system.
>
> >
> > --
> > Hugo
> >
> >
>
>
--
Hugo
next prev parent reply other threads:[~2009-03-03 15:33 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-03 11:52 hugo rivera
2009-03-03 15:19 ` David Leimbach
2009-03-03 15:32 ` Uriel
2009-03-03 16:15 ` hugo rivera
2009-03-03 15:33 ` hugo rivera [this message]
2009-03-03 18:11 ` Roman V. Shaposhnik
2009-03-03 18:38 ` Bakul Shah
2009-03-06 18:47 ` Roman V Shaposhnik
2009-03-06 20:38 ` David Leimbach
2009-03-07 8:00 ` Bakul Shah
2009-03-07 0:21 ` Bakul Shah
2009-03-07 2:20 ` Brian L. Stuart
2009-03-03 23:08 ` J.R. Mauro
2009-03-03 23:15 ` Uriel
2009-03-03 23:23 ` J.R. Mauro
2009-03-03 23:54 ` Devon H. O'Dell
2009-03-04 0:33 ` J.R. Mauro
2009-03-04 0:54 ` erik quanstrom
2009-03-04 1:54 ` J.R. Mauro
2009-03-04 3:18 ` James Tomaschke
2009-03-04 3:30 ` erik quanstrom
2009-03-04 4:44 ` James Tomaschke
2009-03-04 5:05 ` J.R. Mauro
2009-03-04 5:50 ` erik quanstrom
2009-03-04 6:08 ` andrey mirtchovski
2009-03-04 16:52 ` J.R. Mauro
2009-03-04 17:14 ` ron minnich
2009-03-04 17:27 ` William Josephson
2009-03-04 18:15 ` erik quanstrom
2009-03-05 3:32 ` J.R. Mauro
2009-03-05 3:39 ` erik quanstrom
2009-03-05 3:55 ` William K. Josephson
2009-03-05 4:00 ` erik quanstrom
2009-03-05 4:16 ` William K. Josephson
2009-03-07 3:01 ` William Josephson
2009-03-07 3:31 ` erik quanstrom
2009-03-07 6:00 ` William Josephson
2009-03-07 13:58 ` erik quanstrom
2009-03-07 14:37 ` William Josephson
2009-03-07 15:05 ` erik quanstrom
2009-03-07 15:28 ` William K. Josephson
2009-03-07 5:00 ` lucio
2009-03-07 5:08 ` William Josephson
2009-03-07 5:19 ` erik quanstrom
2009-03-07 5:45 ` [9fans] Flash William K. Josephson
2009-03-07 14:42 ` erik quanstrom
2009-03-07 14:56 ` William Josephson
2009-03-07 15:39 ` Russ Cox
2009-03-07 16:34 ` erik quanstrom
2009-03-07 5:24 ` [9fans] threads vs forks lucio
2009-03-04 5:19 ` David Leimbach
2009-03-04 2:47 ` John Barham
2009-03-04 5:24 ` blstuart
2009-03-04 5:37 ` erik quanstrom
2009-03-04 16:29 ` Roman V Shaposhnik
2009-03-04 16:56 ` john
2009-03-06 9:39 ` maht
2009-03-04 5:07 ` David Leimbach
2009-03-04 5:35 ` John Barham
2009-03-03 16:00 ` ron minnich
2009-03-03 16:28 ` hugo rivera
2009-03-03 17:31 ` ron minnich
2009-03-03 16:47 ` John Barham
2009-03-04 9:37 ` Vincent Schut
2009-03-04 9:58 ` hugo rivera
2009-03-04 10:30 ` Vincent Schut
2009-03-04 10:45 ` hugo rivera
2009-03-04 11:15 ` Vincent Schut
2009-03-04 11:33 ` hugo rivera
2009-03-04 13:23 ` Uriel
2009-03-04 14:57 ` ron minnich
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