[R] 64 bit Linux/Ubuntu memory limit problem?

From: zack holden <zack_holden_at_hotmail.com>
Date: Wed, 23 Apr 2008 21:14:20 +0000

Dear list,  

I've recently installed R on a 64 bit machine with 8 GB of RAM. I set this computer up as a dual-boot system, with windows XP 64 and Ubuntu 7.10. I downloaded the Linux 64 bit version of R and installed it.  

I'm trying to run rather large Random forest models and was running into severe memory limitations with my old windows 32 bit machines.  

When I run Random Forest models on my new machine, I get the error message: Error: cannot allocate vector of size 2.1 GB.  

I'm a new Linux user, but I thought that R under Linux would by default take advantage of all available memory. I've searched previous posts and found only 1 thread (posted by David Katz) that didn't really help.  

Do I need to specify that the Ubuntu/Linux OS use all 8 Gigs of RAM? Could I have done something wrong when I downloaded and installed R?  

I'd appreciate any advice.  

Thanks in advance,  

Zack

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