From joehl@web.de  Wed Jan  3 16:02:33 2001
From: joehl@web.de (=?iso-8859-1?Q? Jens=20Oehlschl=E4gel ?=)
Date: Wed, 3 Jan 2001 17:02:33 +0100
Subject: [Rd] memory trouble
Message-ID: <200101031602.RAA15155@mailgate3.cinetic.de>

I don't know whether this belongs to r-devel or rather r-help.

Under RW1.11 --nsize=8M --vsize=512M I could

n <- 500000
m <- 20
x <- matrix(rnorm(n*m), ncol=m, nrow=n)
gc()

> n <- 500000
> m <- 20
> x <- matrix(rnorm(n*m), ncol=m, nrow=n)
> gc()
           free    total (Mb)
Ncells  8190509  8388608  160
Vcells 57033698 67108864  512


# under RW1.20 --vanilla the same fails, some testing shows

n <- 500000
m <- 20

x <- matrix(ncol=m, nrow=n)
x <- matrix(NA, ncol=m, nrow=n)
x <- matrix(0, ncol=m, nrow=n)
x <- matrix(rep(NA, n*m), ncol=m, nrow=n)
x <- matrix(rep('0', n*m), ncol=m, nrow=n)
x <- matrix(rep(0, n*m), ncol=m, nrow=n)
x <- matrix(rep('0', n*m), ncol=m, nrow=n)
gc()
x <- matrix(rep('0', n*m), ncol=m, nrow=n)
x <- matrix(rnorm(n*m), ncol=m, nrow=n)

> n <- 500000
> m <- 20
> 
> x <- matrix(ncol=m, nrow=n)
> x <- matrix(NA, ncol=m, nrow=n)
> x <- matrix(0, ncol=m, nrow=n)
> x <- matrix(rep(NA, n*m), ncol=m, nrow=n)
> x <- matrix(rep('0', n*m), ncol=m, nrow=n)
Error: cannot allocate vector of size 39062 Kb
> x <- matrix(rep(0, n*m), ncol=m, nrow=n)
Error: cannot allocate vector of size 78125 Kb
> x <- matrix(rep('0', n*m), ncol=m, nrow=n)
Error: cannot allocate vector of size 39062 Kb
> gc()
           used (Mb) gc trigger  (Mb)
Ncells   174208  4.7     350000   9.4
Vcells 11109574 84.8   24307903 185.5
> x <- matrix(rep('0', n*m), ncol=m, nrow=n)
> x <- matrix(rnorm(n*m), ncol=m, nrow=n)
Error: cannot allocate vector of size 78125 Kb


Experimenting with --min-nsize=8M --min-vsize=512M --max-nsize=8M --max-vsize=512M did not help. 

What am I doing wrong?


Regards


Jens Oehlschlgel
(Research Consultant)


PIII NT4.0 Service Pack 6, 1 GB RAM, Physical Memory available due to task manager: 934600 K

> version
         _              
platform i386-pc-mingw32
arch     x86            
os       Win32          
system   x86, Win32     
status                  
major    1              
minor    2.0            
year     2000           
month    12             
day      15             
language R  
_______________________________________________________________________
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[Rd] memory trouble
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