[R] large address spaces in R

[Prof Brian D Ripley]

On Fri, 3 Aug 2001 james.holtman at convergys.com wrote:

> I have been using SPLUS on UNIX to do performance analysis of our computers
> and have some matrices that are about 15M rows with 8 columns.  These are
> 'integers' and therefore take up about 500M of memory.  I run on a system
> with 2G of memory and will utilize over a 1G when processing this data.
>
> I am considering using R and was wondering how large addresses spaces are
> handled under WIN/2000.  I can get a server with 2G of memory and am
> interested in experiences of running with data that will utilize this space
> and if Windows will handle it.

With some fragility.  Basically you would need to able to reserve a
contiguous chunk of 1Gb or more of space, and Windows 2000 may not manage
that. (The user address space is 2Gb on Professional, 3Gb on Server, it is
claimed.)  I would start up R aiming to allocate the space initially, via
--min-vsize, --min-nsize and --max-mem-size.

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NOTICE: this reply is with ABSOLUTELY NO WARRANTY.

-- 
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

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