Re: [R] How to increase memory for R on Soliars 10 with 16GB and 64bit R

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Wed 13 Jul 2005 - 17:03:44 EST

On Tue, 12 Jul 2005, Dongseok Choi wrote:

> My machine is SUN Java Workstation 2100 with 2 AMD Opteron CPUs and 16GB RAM.
> R is compiled as 64bit by using SUN compilers.
> I trying to fit quantile smoothing on my data and I got an message as below.
>
>> fit1<-rqss(z1~qss(cbind(x,y),lambda=la1),tau=t1)
> Error in as.matrix.csr(diag(n)) :
cannot allocate memory block of size 2496135168
>
> The lengths of vector x and y are both 17664.
> I tried and found that the same command ran with x[1:16008] and y[1:16008].
> So, it looks to me a memory related problem, but I'm not sure how I can allocate memory block.
> I read the command line option but not sure what do to with it.
> Could you help me on this?

It is trying to allocate a single memory block of size over 2^31-1 bytes. R internally uses ints for sizes of vectors and that is a limit (see help("Memory-limits") ). However, it is intended that on 64-bit systems that there is a limit here of 8*(2^31-1) but there was a typo. Please change line 1534 of src/main/memory.c to

#if SIZEOF_LONG > 4

and re-compile.

-- 
Brian D. Ripley,                  ripley@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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Wed Jul 13 17:07:12 2005

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