[R] 32 vs 64 bit

Roger D. Peng rpeng at jhsph.edu
Thu Dec 15 14:14:17 CET 2005

When we first moved to 64 bit I found that certain things were slower.  I 
believe it is because of the increased overhead for memory management.


Paul Gilbert wrote:
> I ran  R on an AMD Athlon 64 with a 32 bit Linux (by accident, I moved 
> the hard disk from another machine). Now, after install 64 bit Linux and 
> 64 bit R, I am finding some of my R tests are quite a bit slower, I 
> think because memory demands cause a lot of swap. Does anyone know if 
> extra memory usage would be mainly because of R itself, or is there a 
> lot of extra memory demand because of the OS, windowing system, and 
> other apps?
> Paul Gilbert
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Roger D. Peng  |  http://www.biostat.jhsph.edu/~rpeng/

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