On Wed, 5 Apr 2006, Jasjeet Singh Sekhon wrote:
>
> Hi,
>
> 64bit CPUs, such as opterons, help significantly with large databases
> or if you are running multiple processes. But there is a speed
> penalty if you are not.
This would be true of 64-bit builds of R, not 64-bit CPUs.
On a 64-bit processor you can usually run either 64-bit or 32-bit builds
of R, and the 64-bit one will be able to access more memory but will be
slower.
This doesn't mean that a 32-bit build of R on a 64-bit processor will be
slower than a 32-bit build of R on a 32-bit processor.
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
[EMAIL PROTECTED] University of Washington, Seattle
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