[R] Computing very large distance matrix

Liaw, Andy andy_liaw at merck.com
Thu Feb 26 03:00:02 CET 2004

> From: Joel Pitt
> Roger D. Peng wrote:
> > The problem is not with R; the problem is with Windows, as 
> well as the 
> > x86 architecture.  You'll never really be able to access 
> more than 3GB 
> > of physical memory (for a single process). Accessing more than 4GB 
> > requires a 64 bit processor.
> > 
> > -roger
> Alternatively, if you move to Linux you could compile a kernel with
> support for large amounts memory (>4GB) which doesn't require
> a 64 bit processor.

I don't think so.  We have a Xeon with 8GB of RAM running a custom-compiled
kernel with the large memory support.  The kernel does see 8GB, but a single
R process cannot go beyond 3GB.

OTOH our Opteron box has no such problem.


> Joel
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