[R] Performance & capacity characteristics of R?
Prof Brian D Ripley
ripley at stats.ox.ac.uk
Wed Aug 4 08:58:38 CEST 1999
On Wed, 4 Aug 1999, Karsten M. Self wrote:
> Prof Brian D Ripley wrote:
> > R has a workspace size limit of 2048Mb, and on 32-bit machines this cannot
> > be raised more than a tiny amount. I have only run R on a machine with
> > 512Mb of RAM, and on that using objects of more than 100Mb or so slowed it
> > down very considerably.
> Is the 2048 MB limit an artifact of 32 bit address space? Is R 64-bit
> capable on 64 bit architecture (SPARC, Alpha, etc.)?
(For SPARC you would need to use a 64-bit capable compiler and libraries
too.) The limit is an artefact of the assumption that ints are
32 bit. There seem to be quite a few ints around for memory sizes. In
principle one could rewrite this to use longs, but at present R runs
into problems well before the workspace limits are hit, and I am
suggesting that for the sort of things R is most useful for a workspace of
100Mb or so suffices.
Brian D. Ripley, ripley at stats.ox.ac.uk
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 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch
More information about the R-help