[R] Looking for recommendations for optimal memory settings

Douglas Bates bates at stat.wisc.edu
Tue Nov 18 14:53:24 CET 2003

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

> On Mon, 17 Nov 2003, Busch, Joe wrote:
> > We have a Windows 2000 operating system and I need to configure the
> > workstations.  What are your recommendations for users with very large data
> > sets (300Mb)?  The systems are Dell GX240s with 512 Mbs of Ram.  What
> > command line or environment variables work best?
> The default ones.  Just add another 1.5Gb of RAM and then consider
> using --max-mem-size, the only setting that will make any real difference.
> (The next minor version of R, probably 1.9.0, will make better use of 2Gb 
> under Windows than the current one, so you may want to compile up 
> pre-releases of that.)

>From what I can see in looking at a couple of reviews, the GX240 uses
PC133 DIMMs and comes standard with 256 MB.  Depending on the number
of DIMM slots on the motherboard and the capacity of each slot it may
only be able to handle 1GB of memory and even that may mean removing
the 256 MB DIMMs to replace them with 512 MB DIMMs.  The good news is
that doing so is reasonably cheap.  According to www.pricewatch.com PC133
512 MB DIMMs are available for as little as (US)$40 whereas PC133 1 GB
DIMMs are (US)$160 and up.

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