[R] RAM usage

ripley@stats.ox.ac.uk ripley at stats.ox.ac.uk
Tue Oct 22 11:29:10 CEST 2002

On Tue, 22 Oct 2002, Vaidotas Zemlys wrote:

> Hi,
> Brian D. Ripley wrote:
>  >> I did not tell my problem, because I thought that it was more or less
>  >> irrelevant to the memory usage problems I was experiencing. My intention
>  >> was to ask about how R manages memory and is there something special >about
>  >> that management everyone should know, but I don't know. I'm sorry if my
>  >> letter was a bit unclear, English is not my native language.
>  > But you did claim `must be used'.  That really is rarely the case, and
>  > the skill in programming R (or S) is use memory within the resources
>  > available.
> Yes I did write 'must be used', yet I did not want to claim anything.
> Really, I did not want to express so strictly. I should of used 'is used',
> or something else. As I said English is not my native language:)
> I tried to run the same calculations with initial matrix size of 7500 rows
> and 70 columns, on Linux machine as you suggested.  Debian Woody, R version
> 1.5.1 with 256 MB RAM and 256 MB Swap, everything worked fine, not like on
> Windows 2000 Professional machine with 256 RAM. It seems that Win2k is
> really missing something with memory management, or R windows build is
> somewhat different from linux build?

It's Windows.  We have on Windows to use a non-standard memory manager as
the native one is so slow.  Both don't handle large memory blocks well.

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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