[R] Memory R and Windows2000

ripley@stats.ox.ac.uk ripley at stats.ox.ac.uk
Fri Nov 8 19:18:48 CET 2002

On Fri, 8 Nov 2002, demolombe wrote:

> Hello,
> when using:  rm(list=ls(all=TRUE))  and gc() command , and looking at the
> memory
> used by Rgui.exe  in window2000 there is no change.
> this is strange .

Not if there were no objects there.  You may need to call gc() repeatedly
to see a reduction in the limits.

> Actually I need to be sure that memory is given back to the system
> because the users of the application I wrote under R are opening and closing
> big files of data;
> can I rely on the gc() function under win2k?

No, nor anywhere else.  It only tells you about internal allocations.
You could try ?memory.size to find out what you really want.

It's not reasonable to expect applications to give memory back to the
OS nor for the OS to reuse it.  It is _virtual_ memory we are talking
about here.

There is quite a lot of documentation in the sources about memory
management (e.g. in memory.c and in the Windows CHANGE file). Do search it

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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