[R] Comparing execution times

Steve Lianoglou mailinglist.honeypot at gmail.com
Mon Apr 11 19:09:59 CEST 2011

Just a comment about your use of foreach:

On Mon, Apr 11, 2011 at 6:29 AM, Alaios <alaios at yahoo.com> wrote:
> C.Case. Foreach is considered to be easier to be applied to manycores.
> foreach (i=1:dimz) %do% {
>    print(sprintf('Creating the %d map',i));
>    Shadowlist[,,i]<-f <- GaussRF(x=x, y=y, model=model, grid=TRUE,param=c(mean,variance,nugget,scale,Whit.alpha))
> }

You are still running this sequentially.

To run in parallel, you need load the appropriate parallel backend,
and use %dopar%:

foreach(i=1:dimz) %dopar% { ... }

Steve Lianoglou
Graduate Student: Computational Systems Biology
 | Memorial Sloan-Kettering Cancer Center
 | Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/~lianos/contact

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