[R] R-1.6.0 compiled on 64-bit AIX- memory problem?

Thomas Lumley tlumley at u.washington.edu
Wed Oct 23 19:52:21 CEST 2002

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.


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