[R] (performance) time in Windows vs Linux

[Raymond Wan]

Hi,


milton ruser wrote:
> 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 don't know the answer in the context of R -- I didn't know that R can 
use multiple cores by default?  But in general, I use "htop", whose man 
pages describes it as:  "This program is a free (GPL) ncurses-based 
process viewer."

It is a colored version of "top", essentially.  At the top of the 
screen, you will see your 4 cores represented as percentages.  Under 
Setup, add "Processor" to the list of options and then "CPU" will appear 
as a column, which if you have 4 cores, the values will vary from 1 to 4.

If you want to check if R is running on more than one core, then 
obviously R should appear more than once and with two different values 
under CPU.

Ray