[R] memory issues

[Dave Depew]

Hi all,
I've read the R for windows FAQ and am a little confused re: 
memory.limit and memory.size

to start using R 2.6.2 on WinXP, 2GB RAM, I have the command line "sdi 
--max-mem-size=2047M"
Once the Rgui is open, memory.limit() returns 2047, memory.size() 
returns 11.315, and memory.size(max=T) returns 19.615

Shouldn't memory.size(max=T) return 2047?

Upon running several operations involving kriging (gstat package, 
original data file 3 variables, 12000 observations)
 the program runs out of memory

"memory.c", line 57: can't allocate memory in function m_get()
Error in predict.gstat(fit.uk, newdata = EcoSAV.grid.clip.spxdf, 
debug.level = -2,  :
  m_get

Immediately following this,

memory.limit() returns [1] -Inf
                        Warning message:
                            In memory.limit() : no non-missing arguments 
to max; returning -Inf

memory.size() returns 24.573.

memory.size(max=T) returns 46.75

To my untrained eye, it appears that R is not being allowed access to 
the full memory limit specified in the cmd line....if this is the case, 
how does one ensure that R is getting access to the full allotment of RAM?
Any insight is appreciated...


 > sessionInfo()
R version 2.6.2 (2008-02-08)
i386-pc-mingw32

locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United 
States.1252;LC_MONETARY=English_United 
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices datasets  tcltk     utils     
methods   base    

other attached packages:
 [1] maptools_0.7-7 foreign_0.8-23 gstat_0.9-43   rgdal_0.5-24   
lattice_0.17-4 sp_0.9-23      svSocket_0.9-5 svIO_0.9-5     
R2HTML_1.58    svMisc_0.9-5   svIDE_0.9-5  

loaded via a namespace (and not attached):
[1] grid_2.6.2  tools_2.6.2