[Rcpp-devel] OpenMP and Rinside
David Ibarra Gómez
dibarra at aqualogy.net
Tue Jul 31 13:41:49 CEST 2012
Thank you, Dirk.
I'll try with MPI, futhermore It'll be ready for a cluster enviroment.
David Ibarra Gomez
De: Dirk Eddelbuettel [mailto:edd at debian.org]
Enviado el: martes, 31 de julio de 2012 13:39
Para: David Ibarra Gómez
CC: rcpp-devel at lists.r-forge.r-project.org
Asunto: Re: [Rcpp-devel] OpenMP and Rinside
On 31 July 2012 at 12:36, David Ibarra Gómez wrote:
| Hi Peter,
| I'm looking at MPI examples, thank you for the advice.
| But If It's possible to use several instances with MPI. I think It should be possible with OpenMP.
You missed the subtle point that Open MPI spawns multiple _processes_ (which are independent) where Open MP spawns multiple _threads_ (which are not).
One works, the other doesn't.
| Thank you
| David Ibarra Gomez
| -----Mensaje original-----
| De: Peter Aberline [mailto:Peter.Aberline at rms.com] Enviado el: martes,
| 31 de julio de 2012 12:32
| Para: David Ibarra Gómez; rcpp-devel at lists.r-forge.r-project.org
| Asunto: RE: OpenMP and Rinside
| > From: rcpp-devel-bounces at lists.r-forge.r-project.org
| > [mailto:rcpp-devel-bounces at lists.r-forge.r-project.org] On Behalf Of
| > David Ibarra Gómez
| > I was mixing RInside with OpenMP. When I try to run the software, I get a message in three of the four threads (4 Cores Multicore).
| > Exception caught: can only have one RInside instance Exception caught:
| > can only have one RInside instance Exception caught: can only have
| > one RInside instance
| Hi David,
| It's my understanding is that the RInside class is a singleton as R is strictly single threaded. The message you are seeing if an exception thrown because the singleton constraint is violated.
| There are some examples that ship with RInside which demonstrate the use of multiple RInside processes using MPI. They might help you achieve the parallelism you are wanting.
| Correct me if I'm wrong, Dirk.
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