[R] (performance) time in Windows vs Linux

[Zeljko Vrba]

On Mon, Jun 29, 2009 at 06:56:55PM +1200, Patrick Connolly wrote:
> On Mon, 29-Jun-2009 at 02:13AM -0400, milton ruser wrote:
> 
> |> Really?
> |> 
> |> In fact I have a quadcore. But how can I know if Linux are really
> |> using only one core, and how can I setup it to use the 4cores?
> 
> I use GKrellM (install with "aptitude install gkrellm" if you don't
> have it already).  It shows a trace of the % activity for each CPU
> where it's very clear if only one is being used.  I've never had
> occasion to change such a setting, but someone more skilled in such
> things could say how to make it use more than one.
> 
How do you know that it is *R* that uses all 4 CPUs, and not other applications
on the system?  What does running "top" in the terminal say?  If R uses more
than one CPU, it's CPU usage will be > 100%.