The wmic command line utility can also be used to query this; on a
dual-core Vista laptop I get
C:\Users\luke>wmic cpu get NumberOfCores,NumberOfLogicalProcessors
NumberOfCores NumberOfLogicalProcessors
2 2
luke
--
Luke Tierney
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: [EMAIL PROTECTED]
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
On Tue, 9 Sep 2008, [EMAIL PROTECTED] wrote:
Many thanks, that's very helpful.
Regards,
Tolga
----- Original Message -----
From: Prof Brian Ripley [EMAIL PROTECTED]
Sent: 09/09/2008 20:57 CET
To: Tolga Uzuner
Cc: r-help@r-project.org
Subject: Re: [R] Information on the number of CPU's
On Tue, 9 Sep 2008, [EMAIL PROTECTED] wrote:
Dear R Users,
I am on Windows XP SP2 platform, using R version 2.7.2 . I was wondering
if there is a way to find out, within R, the number of CPU's on my machine
? I would use this information to set the number of nodes in a cluster,
depending on the machine. Sys.info() and .Platform do not carry this
information.
Correct, since
a) R does not make use of more than 1.
b) It is really not portable, and not even well-defined. (How many CPUs has
a hyperthreaded dual Xeon? Some say 2, some say 4. Do you want CPUs or
cores? If this is a virtualized OS, is the physical number or the logical
number?)
In the case of Windows, how depends on the Windows version. The w32api (XP
or later) call GetNativeSystemInfo will tell you the number of CPUs, for some
(unstated) definition of 'CPU'. Later versions have
GetLogicalProcessorInformation, which can give the number of cores.
Thanks in advance,
Tolga Uzuner
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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