On Apr 25, 2008, at 4:34 PM, Guillaume Blanchet wrote: > Hi ! > > I have installed R-2.7.0 64-bits on a computer where the new Ubuntu > version (8.04) was installed. This computer is a 3.2 GHz Dual-core > with > 2 Gb of RAM. > > To test how fast (I though !) this machine is, I compared two simple > matrix manipulations between Ubuntu and my laptop (a MacBook Pro > 2.2 GHz > with also 2 Gb of RAM under Mac OS X 10.5.2). By the way, I install > the > normal version of R on my MacBook Pro (32-bits) > >
A guess to get that big a difference is that one has an optimized BLAS and the other doesn't. Try something not so heavily dependent on BLAS and see what the times are. -Roy M ********************** "The contents of this message do not reflect any position of the U.S. Government or NOAA." ********************** Roy Mendelssohn Supervisory Operations Research Analyst NOAA/NMFS Environmental Research Division Southwest Fisheries Science Center 1352 Lighthouse Avenue Pacific Grove, CA 93950-2097 e-mail: [EMAIL PROTECTED] (Note new e-mail address) voice: (831)-648-9029 fax: (831)-648-8440 www: http://www.pfeg.noaa.gov/ "Old age and treachery will overcome youth and skill." ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.