Re: [R] Accessing more than 2GB memory in Windows

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From: Marcus Davy (
Date: Tue 25 May 2004 - 07:39:39 EST

Message-id: <>

thanks to Prof Brian Ripley for clarifying this, I should have stated
that the FAQ link I provided
was for R 1.9.0 for windows.

A nice summary of the issue on 32 bit systems and physical RAM
limitations of (more recent)
windows operating systems can be found at:

According to microsoft information the /3GB switch in the Boot.ini is
available for the following
operating systems;

Windows XP Professional
Windows Server 2003
Windows Server 2003, Enterprise Edition
Windows Server 2003, Datacenter Edition
Windows 2000 Advanced Server
Windows 2000 Datacenter Server
Windows NT Server 4.0, Enterprise Edition


>>> Prof Brian Ripley <> 22/05/2004 10:11:48 PM
R can.

R 1.8.1 cannot, but it is obselete.

On Thu, 20 May 2004, Marcus Davy wrote:

> I am also interested in the same topic, that is windows 32bit
> restriction to 4Gigs of virtual
> address space partitioning into User and System space.
> For your reconfigured server 3:1 User to System space what does
> memory.limit()
> say is available?
> For those interested a windows FAQ link on this subject is

(and in the distribution, lonked from the menus). That explicitly says

  The information here applies only to recent versions of R for
  (1.9.0 or later); the current version is often called something like

  rw1090 (although not officially).

At least two users who were interested have reported success after
following those instructions (during the pre-release testing phase).

Brian D. Ripley,         
Professor of Applied Statistics, 
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595


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