Message-ID: <Pine.LNX.4.33.0107160842340.5416@hymn02.u.washington.edu>
Date: 2001-07-16T15:42:34Z
From: Thomas Lumley
Subject: Trouble with the memory allocation
In-Reply-To: <3b52f25b.98e51b35@cbs.dtu.dk>
On Mon, 16 Jul 2001, Laurent Gautier wrote:
> Dear R-users,
>
>
> I am currently facing what appears to be a strange thing (at least to my
> humble understanding).
>
> If I understood correctly, starting with the version 1.2.3, R memory
> allocation can be done dynamically,
> and there is no need to fiddle with the --nsize and --vsize parameter
> any longer...
>
> So far this everything seemed to go this way (I saw the size of my
> processes growing when I was using big objects and
> so on). Howver recently I had trouble with the memory. It seems there is
> a limit of about 1,2 Go, beyond which R starts
> to send memory allocation error messages... not consistent with the
> memory still available
> (like 'Error: cannot allocate vector of size 125382 Kb', while there
> still about 17Go free).
>
There is an upper limit on the memory size because some internal objects in the memory manager are stored as ints (even on a 64-bit system this limits you, I think, to 4Gb, but it may be 2Gb).
It shouldn't be too hard to expand these limits for 64-bit systems. There is a much firmer limit in the design of R to no more than 2^31 objects, and to objects of maximum length 2^31, but this would still allow multigigabyte workspaces.
-thomas
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