R help - Oct 2002 - R-1.6.0 compiled on 64-bit AIX- memory problem?

Hello,

Is it true that R-1.6.0 compiled under 64-bit is less efficient on using
memory than compiled under 32-bit?

Here are my observations:

1. I have an SGI IRIX box (2Gb RAM) running 32-bit version of R-1.5.0. It
CAN handle a large data set (an 1111000 * 18 array).
2. For the same data set, on an IBM AIX 64-bit box (64GB RAM) with the new
version of R-1.6.0, it gives an out of memory error.

I am not sure if the problem is caused by 32-/64-bit compilation, or other
AIX vs IRIX issues.

Can the AIX problem be solved by compiling R-1.6.0 under 32-bit?

Thanks!

Simon

===============================================================     Simon Lin,
M.D.
     Ph: (919) 681-9646 FAX: (919) 681-8028
     Lin00025 (at) mc.duke.edu
     Box 3958, Duke University Medical Center
     Durham, NC 27710
===============================================================


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On Wed, 23 Oct 2002, Simon M Lin wrote:
> Hello,
>
> Is it true that R-1.6.0 compiled under 64-bit is less efficient on using
> memory than compiled under 32-bit?
Yes. Pointers take up twice as much space.
> Here are my observations:
>
> 1. I have an SGI IRIX box (2Gb RAM) running 32-bit version of R-1.5.0. It
> CAN handle a large data set (an 1111000 * 18 array).
> 2. For the same data set, on an IBM AIX 64-bit box (64GB RAM) with the new
> version of R-1.6.0, it gives an out of memory error.
>
> I am not sure if the problem is caused by 32-/64-bit compilation, or other
> AIX vs IRIX issues.
The pointer size difference shouldn't affect an array that much.


	-thomas

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