[R-SIG-Mac] R multi-cpu and 64 bit

[Luke Tierney]

I hope in the next month or two to start looking into using multiple
threads in R's vectorized arithmetic system on multiprocessor systems.
Preliminary experiments suggest that this might be useful for some of
the more intensive functions in the math library, but It's not yet
clear whether this will pay off enough to warrant reorganizations that
might be needed -- we should know more before too long.

Best,

luke

On Thu, 2 Nov 2006, Thomas Lumley wrote:

> On Thu, 2 Nov 2006, elw at stderr.org wrote:
>
>>
>>
>> Using SNOW, or MPI, or some careful batch programming to split up your
>> tasks across CPUs - yes.
>>
>> This is the same sort of thing you'd likely face in Stata -- unless
>> they've invested a HUGE amount of effort in making threaded/parallelized
>> computations "easier".
>
> It turns out that they have.  This is made easier for them by the
> relatively limited data model, but it is still pretty impressive.
> The Stata people really do have a clue, surprising as this seems when you
> first look at their macro language (and even that improves on further
> consideration)
>
> 	-thomas
>
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-- 
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa                  Phone:             319-335-3386
Department of Statistics and        Fax:               319-335-3017
    Actuarial Science
241 Schaeffer Hall                  email:      luke at stat.uiowa.edu
Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu