From sgiannerini at gmail.com  Mon Mar  6 18:29:10 2006
From: sgiannerini at gmail.com (Simone Giannerini)
Date: Mon, 6 Mar 2006 18:29:10 +0100
Subject: [Rd] Running R on dual/quad Opteron machines
In-Reply-To: <Pine.LNX.4.64.0603060906130.24583@homer24.u.washington.edu>
References: <3c12769c0603060850pd3bbc73gb40a5e9f324d8050@mail.gmail.com>
	<Pine.LNX.4.64.0603060906130.24583@homer24.u.washington.edu>
Message-ID: <3c12769c0603060929k3c974861h6badd72e47ebe4af@mail.gmail.com>

On 3/6/06, Thomas Lumley <tlumley at u.washington.edu> wrote:
> On Mon, 6 Mar 2006, Simone Giannerini wrote:
> > The environment will probably be either Unix/Linux or Solaris and the
> > amount of RAM will be 8-16Gb, depending on the number of processors.
> > My main concerns are the following:
> >
> > 1. How much does R  benefit from passing from one processor to
> > two/four processor machines? Consider that the typical intensive use
> > of the server
> > will be represented by simulation studies with many repeated loops.
>
> The typical way that R is used on multiprocessor systems is running more
> than one program, rather than parallel processing. If four people are
> using the computer or if one person splits 10,000 iterations of a
> simulation into 4 sets of 2,500 you will be using all four processors.
>

Many thanks, if I have understood correctly, in this case I would need
running four separate instances of R, since a single thread cannot
exploit more than one cpu, am I correct?

Regards,

Simone

--
______________________________________________________

Simone Giannerini
Dipartimento di Scienze Statistiche "Paolo Fortunati"
Universita' di Bologna
Via delle belle arti 41 - 40126  Bologna,  ITALY
Tel: +39 051 2098248  Fax: +39 051 232153
E-mail: giannerini at stat.unibo.it



[Rd] Running R on dual/quad Opteron machines
Simone Giannerini