Message-ID: <Pine.LNX.4.64.0712172011390.8627@perrin.socsci.unc.edu>
Date: 2007-12-18T01:13:16Z
From: Andrew Perrin
Subject: Dual Core vs Quad Core
In-Reply-To: <674056.74408.qm@web36304.mail.mud.yahoo.com>
On Mon, 17 Dec 2007, Kitty Lee wrote:
> Dear R-users,
>
> I use R to run spatial stuff and it takes up a lot of ram. Runs can take hours or days. I am thinking of getting a new desktop. Can R take advantage of the dual-core system?
>
> I have a dual-core computer at work. But it seems that right now R is using only one processor.
>
> The new computers feature quad core with 3GB of RAM. Can R take advantage of the 4 chips? Or am I better off getting a dual core with faster processing speed per chip?
>
> Thanks! Any advice would be really appreciated!
>
> K.
If I have my information right, R will use dual- or quad-cores if it's
doing two (or four) things at once. The second core will help a little bit
insofar as whatever else your machine is doing won't interfere with the
one core on which it's running, but generally things that take a single
thread will remain on a single core.
As for RAM, if you're doing memory-bound work you should certainly be
using a 64-bit machine and OS so you can utilize the larger memory space.
----------------------------------------------------------------------
Andrew J Perrin - andrew_perrin (at) unc.edu - http://perrin.socsci.unc.edu
Associate Professor of Sociology; Book Review Editor, _Social Forces_
University of North Carolina - CB#3210, Chapel Hill, NC 27599-3210 USA