[R] Memory Management under Linux: Problems to allocate large amounts of data

[Peter Dalgaard]

Prof Brian Ripley <ripley at stats.ox.ac.uk> writes:

> On Thu, 30 Jun 2005, Dubravko Dolic wrote:
> 
> > Dear Prof. Ripley.
> >
> > Thank You for Your quick answer. Your right by assuming that we run
> > R on a 32bit System. My technician tried to install R on a emulated
> > 64bit Opteron machine which led into some trouble. Maybe because the
> > Opteron includes a 32bit Processor which emulates 64bit (AMD64
> > x86_64). As You seem to have good experience with running R on a
> > 64bit OS I feel encouraged to have another try for this.

Er? What is an "emulated Opteron" machine? Opterons are 64 bit.
 
> It should work out of the box on an Opteron Linux systen: it does for
> example on FC3 and SuSE 9.x.  Some earlier Linux distros for x86_64 are
> not fully 64-bit, but we ran R on FC2 (although some packages could
> not be installed).
> 
> Trying to build a 32-bit version of R on FC3 does not work for me: the
> wrong libgcc_s is found.  (One might want a 32-bit version for speed
> on small tasks.)

On FC4 it is even easier: "yum install R R-devel" gets you a working R
2.1.1 straight away (from Fedora Extras). Only if you want to include
hardcore optimized BLAS or do not like the performance hit of having R
as a shared library do you need to compile at all.

-- 
   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
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