[R] Threads in R

[Peter Langfelder]

On Mon, Aug 22, 2011 at 3:12 PM, Immanuel <mane.desk at googlemail.com> wrote:
> Hello,
>
> thanks for the input. Below is a small example, simpler then expected :)
>  I'm just curious why I can't see any output from print(i).
>
> ----------------------
> library(multicore)
>
> f_long <- function() {
>    for (i in 1:100000000){ a=i}
>        print(i)
>    return("finished")
> }
>
> p_long <- parallel(f_long() ,silent =FALSE    )
> collect(p_long, wait=FALSE, 10)
> # stops the execution since its not finished after 10sec
> # on my machine anyway ;)

I could be wrong on this, but according to the help file, collect(wait
= FALSE) will not kill the child process, it will only collect
whatever result the child process has sent until then using
sendMaster(). I believe you have to kill() the child process to stop
it completely.

Peter