[R] Memory Allocation

[ripley@stats.ox.ac.uk]

On Fri, 22 Mar 2002, Shawn Way wrote:

> I'm trying to run a small batch program under the windows version of R
> 1.5.0.  One thing I'm noticing is that if I source the program under Rgui.

R 1.5.0 is not released.  What is this?  Where did you get it from, or
did you compile it yourself from R-devel?

> The application will work just fine, but if I use Rcmd BATCH --no-save
> -max-mem-size=500M water.R as the batch process, it will not finish. (Or
> even load the first file)

Is that really the same version of R? That was a known problem in R 1.4.0,
solved in 1.4.1.

> The programs load 4 CSV files at ~ 8 MB each, they are merged into two
> data.frames and the original data is purged.
>
> The error I get from the output file is:
>
> >PFWA <-
> read.csv("c:/temp/PFWA.csv",header=FALSE,strip.white=TRUE,na.strings=c("NULL
> "),col.names=c("DateTime","Flow","Volume"))
> Error: cannot allocate vector of size 235 Kb
> In addition: Warning message:
> Reached total allocation of 500Mb: see help(memory.size)
> Execution halted

In general, don't increase --max-mem-size (it's --) unless you are
really sure you have enough usable RAM.

-- 
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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