Dear prof. Ripley, many thanks for the clarification, now I have good elements for managing the purchase.
kind regards, Simone Giannerini On 3/7/06, Prof Brian Ripley <[EMAIL PROTECTED]> wrote: > On Tue, 7 Mar 2006, Simone Giannerini wrote: > > > Ok thanks, I am wondering whether running multiple instances of R > > would be possible without problems in presence of compiled code > > (shared libraries). > > Intuitively, while there can be multiple instances of R, all of them > > would be using the same library, but I am just guessing, I might do a > > check on this. > > That's what the `shared library' means. The common parts (e.g. code and > static data) are shared, but the data areas are not. > > Different processes run in different address spaces, and modern OSes are > careful only to give a user process write access to its own address space. > > Many of us have servers running multiple copies of R at almost all times. > I typically run R tests with four copies running on a dual-CPU Opteron, > that being about the minimum number needed to get 100% CPU usage since I/O > is also being done. > > > > > Ciao > > > > Simone > > > >> > >> And let me couch my earlier statements on snow/Rmpi by saying that we use > >> these tools on a relatively large beowulf cluster (~200 nodes), which is > >> somewhat different than a single box with 2-4 processors, so it is may not > >> be worth the trouble outside of a cluster environment. For example, we > >> have > >> not moved to using Rmpi/snow on our dual-processor G5s because the speed > >> gain just isn't worth the extra installation trouble, etc. > >> > >> Sean > > -- > Brian D. Ripley, [EMAIL PROTECTED] > Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ > University of Oxford, Tel: +44 1865 272861 (self) > 1 South Parks Road, +44 1865 272866 (PA) > Oxford OX1 3TG, UK Fax: +44 1865 272595 > -- ______________________________________________________ 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: [EMAIL PROTECTED] ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
